<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1026-8774</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias geológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. cienc. geol]]></abbrev-journal-title>
<issn>1026-8774</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1026-87742005000100048</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Maastrichtian shallow-water ammonites of northeastern Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Ammonites de agua somera del Maastrichtiano del noreste de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ifrim]]></surname>
<given-names><![CDATA[Christina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Stinnesbeck]]></surname>
<given-names><![CDATA[Wolfgang]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Schafhauser]]></surname>
<given-names><![CDATA[Armin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universität Karlsruhe Institut für Regionale Geologie ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Germany</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<volume>22</volume>
<numero>1</numero>
<fpage>48</fpage>
<lpage>64</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742005000100048&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742005000100048&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742005000100048&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In northeastern Mexico, extensive deltaic and prodeltaic sediment complexes developed during Maastrichtian times, known as the Difunta Group and Escondido Formation in Coahuila and the Northwest of Nuevo León, and the Cárdenas Formation in San Luis Potosí. These sediments contain abundant and diverse invertebrate assemblages, among them the last ammonites in the area, prior to their extinction. Sphenodiscus (S. lobatus, S. pleurisepta) and Coahuilites sheltoni are the dominant elements of this paucispecific fauna and clearly favored shallow water coastal environments. Ammonites other than sphenodiscids are rare and restricted to occasional Baculites ovatus and a single Pachydiscus (Pachydiscus) neubergicus. This early (and possibly early late) Maastrichtian assemblage differs notably from the coeval ammonite fauna of the distal prodeltaic and open marine Méndez Formation in eastern Nuevo León. The latter assemblage is far more diverse (23 species referred to 18 genera) and includes, in addition to typical Gulf of Mexico faunal elements, many Tethyan, cosmopolitan, and even southern high latitude Indopacific species previously unknown from Mexico. Faunal differences between the two nearby outcrop areas are thus clearly related to paleobathymetry and not to paleobiogeography, being Baculites ovatus the only conspecific element.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Durante el Maastrichtiano, complejos deltaicos y prodeltaicos extensos se desarrollaron en el Noreste de México, y se conocen como grupo Difunta y formación Escondido en Coahuila y el Noroeste de Nuevo León, y formación Cárdenas en el Estado de San Luis Potosí. Los sedimentos contienen asociaciones abundantes y diversas de invertebrados, entre ellos los últimos ammonites en la región, previos a su extinción. Sphenodiscus (S. lobatus, S. pleurisepta) y Coahuilites sheltoni son los elementos dominantes de esta fauna pauciespecífica y claramente favorecieron ambientes costeros someros. Ammonites que no pertenecen a los sphenodiscidos son mucho más escasos y se restringen a Baculites ovatus y un sólo ejemplar de Pachydiscus ( Pachydiscus) neubergicus. Esta asociación caracteriza al Maastrichtiano temprano (y posiblemente la parte temprana del Maastrichtiano tardío) . Difiere notablemente de la fauna coetánea de la formación Méndez del Este de Nuevo León, la cuál fue depositado en ambientes prodeltaicos distales y de mar abierto. La fauna de la formación Méndez es mucho más diversa (23 especies pertenecientes a 18 géneros) e incluye, aparte de elementos faunísticos típicos del Golfo de México, especies tethysianas, cosmopolitas, y hasta especies indopacificas de latitudes australes altas. Estos elementos habían sido desconocidos en México hasta la fecha. Las diferencias faunísticas entre las dos regiones cercanas del Noreste de México se deben, por lo tanto, a diferencias en la paleobatimetría y no a la paleobiogeografía. El único elemento idéntico es Baculites ovatus.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[ammonites]]></kwd>
<kwd lng="en"><![CDATA[paleobathymetry]]></kwd>
<kwd lng="en"><![CDATA[Maastrichtian]]></kwd>
<kwd lng="en"><![CDATA[Upper Cretaceous]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="es"><![CDATA[ammonites]]></kwd>
<kwd lng="es"><![CDATA[paleobatimetría]]></kwd>
<kwd lng="es"><![CDATA[Maastrichtiano]]></kwd>
<kwd lng="es"><![CDATA[Cretácico Superior]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Anderson]]></surname>
<given-names><![CDATA[F.M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Upper Cretaceous of the Pacific Coast]]></article-title>
<source><![CDATA[New York, Geological Society of America Memoir]]></source>
<year>1958</year>
<volume>71</volume>
<page-range>378</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Aranda-Manteca]]></surname>
<given-names><![CDATA[F.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Stinnesbeck]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Primer registro de mosasauridos en México]]></article-title>
<source><![CDATA[Actas de la Facultad de Ciencias de la Tierra de la Universidad Autónoma de Nuevo León]]></source>
<year>1995</year>
<volume>8</volume>
<page-range>1-8</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Barrera]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Savin]]></surname>
<given-names><![CDATA[S.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Thomas]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Jones]]></surname>
<given-names><![CDATA[C.E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Evidence for thermohaline-circulation reversals controlled by sea-level changes in the latest Cretaceous]]></article-title>
<source><![CDATA[Geology]]></source>
<year>1997</year>
<volume>25</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>715-8</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bayer]]></surname>
<given-names><![CDATA[U.]]></given-names>
</name>
<name>
<surname><![CDATA[McGhee Jr.]]></surname>
<given-names><![CDATA[G.R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Iterative evolution of Middle Jurassic ammonite faunas]]></article-title>
<source><![CDATA[Lethaia]]></source>
<year>1984</year>
<volume>17</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>1-16</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Binkhorst]]></surname>
<given-names><![CDATA[J.T.]]></given-names>
</name>
</person-group>
<source><![CDATA[Monographie des gastropodes et des céphalopodes de la Craie Supérieure du Limburg]]></source>
<year>1861</year>
<page-range>17+83</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Böhm]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Über Ammonites pedernalis v. Buch]]></article-title>
<source><![CDATA[Zeitschrift der Deutschen Geologischen Gesellschaft]]></source>
<year>1898</year>
<volume>50</volume>
<page-range>183-201</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Böse]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Cretaceous ammonites from Texas and northern Mexico]]></article-title>
<source><![CDATA[University of Texas Bulletin]]></source>
<year>1928</year>
<volume>2748</volume>
<page-range>143-357</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Caron]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Cretaceous planktic foraminifera]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Bolli]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Saunders]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Perch-Nielsen]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<source><![CDATA[Plankton Stratigraphy]]></source>
<year>1985</year>
<page-range>17-87</page-range><publisher-loc><![CDATA[Cambridge ]]></publisher-loc>
<publisher-name><![CDATA[Cambridge University Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Caus]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Tambareau]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Colin]]></surname>
<given-names><![CDATA[J.-P.]]></given-names>
</name>
<name>
<surname><![CDATA[Aguilar]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Bernaus]]></surname>
<given-names><![CDATA[J.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Gómez-Garrido]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Brusset]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Upper Cretaceous microfauna of the Cárdenas Formation, San Luis Potosí, NE Mexico. Biostrati-graphical, palaeoecological, and palaeogeographical significance]]></article-title>
<source><![CDATA[Revista Mexicana de Ciencias Geológicas]]></source>
<year>2002</year>
<volume>19</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>137-44</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Christensen]]></surname>
<given-names><![CDATA[W.K.]]></given-names>
</name>
<name>
<surname><![CDATA[Hancock]]></surname>
<given-names><![CDATA[J.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Peake]]></surname>
<given-names><![CDATA[N.B.]]></given-names>
</name>
<name>
<surname><![CDATA[Kennedy]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The base of the Maastrichtian]]></article-title>
<source><![CDATA[Bulletin of the Geological Society of Denmark]]></source>
<year>2000</year>
<volume>47</volume>
<page-range>81-5</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cobban]]></surname>
<given-names><![CDATA[W.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Ammonites from the Navesink Formation at Atlantic Highlands, New Jersey]]></article-title>
<source><![CDATA[United States Geological Survey Professional Paper]]></source>
<year>1974</year>
<volume>845</volume>
<page-range>1-46</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cobban]]></surname>
<given-names><![CDATA[W.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Kennedy]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Upper Cretaceous ammonites from the Nacatotch Sand of Hempstead County, Arkansas]]></article-title>
<source><![CDATA[United States Geological Survey Bulletin]]></source>
<year>1991</year>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cobban]]></surname>
<given-names><![CDATA[W.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Kennedy]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Upper Cretaceous (Maastrichtian) ammonites from the Nostoceras alternatum zone in southwestern Arkansas]]></article-title>
<source><![CDATA[United States Geological Survey, Bulletin]]></source>
<year>1991</year>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cobban]]></surname>
<given-names><![CDATA[W.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Kennedy]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Maastrichtian ammonites chiefly from the Prairie Bluff Chalk in Alabama and Mississippi]]></article-title>
<source><![CDATA[Journal of Paleontology]]></source>
<year>1995</year>
<volume>69</volume>
<page-range>40</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Conrad]]></surname>
<given-names><![CDATA[T.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Descriptions of Cretaceous and Tertiary fossils]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Emery]]></surname>
<given-names><![CDATA[W.H.]]></given-names>
</name>
</person-group>
<source><![CDATA[Report on the United States and Mexican boundary survey]]></source>
<year>1857</year>
<volume>1</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>140-74</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cooper]]></surname>
<given-names><![CDATA[J.D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Stratigraphy and paleontology of Escondido Formation (Upper Cretaceous), Maverick County, Texas, and northern Mexico]]></source>
<year>1970</year>
<page-range>288</page-range><publisher-loc><![CDATA[Austin ]]></publisher-loc>
<publisher-name><![CDATA[University of Texas]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cooper]]></surname>
<given-names><![CDATA[J.D.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Maestrichtian (Upper Cretaceous) biostratigraphy, Maverick County, Texas, and northern Coahuila, Mexico]]></article-title>
<source><![CDATA[Trans-actions of the Gulf Coast Association of Geological Societies]]></source>
<year>1971</year>
<volume>21</volume>
<page-range>57-65</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Defrance]]></surname>
<given-names><![CDATA[M.J.L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Dictionnaire des sciences naturelles, dans lequel on traîte méthodiquement des différents êtres de la nature. Par plusieurs professeurs du Jardin du Roi, et des principales écoles de Paris, 1816-1830]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Defrance]]></surname>
<given-names><![CDATA[M.J.L.]]></given-names>
</name>
<name>
<surname><![CDATA[Blainville]]></surname>
<given-names><![CDATA[H.M.L.]]></given-names>
</name>
<name>
<surname><![CDATA[Leach]]></surname>
<given-names><![CDATA[W.E.]]></given-names>
</name>
</person-group>
<source><![CDATA[Strasbourg and Paris, Levrault]]></source>
<year>1816</year>
<volume>3</volume>
<page-range>492</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[d&#8217;Orbigny]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Prodrome de Paléontologie Stratigraphique Universelle des Animaux Mollusques et Rayonnées]]></article-title>
<source><![CDATA[Cours Élémentaire de Paléontologie et de Géologie Stratigraphiques]]></source>
<year>1850</year>
<volume>2</volume>
<page-range>428</page-range><publisher-loc><![CDATA[Paris ]]></publisher-loc>
<publisher-name><![CDATA[Victor Masson]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Forbes]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Report on the Cretaceous fossil invertebrates from southern India, collected by Mr. Kaye and Mr. Cunliffe]]></article-title>
<source><![CDATA[Transactions of the Geological Society of London]]></source>
<year>1846</year>
<volume>7</volume>
<page-range>97-174</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gill]]></surname>
<given-names><![CDATA[J.R.]]></given-names>
</name>
<name>
<surname><![CDATA[Cobban]]></surname>
<given-names><![CDATA[W.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The Red Bird section of the Upper Cretaceous Pierre Shale in Wyoming]]></article-title>
<source><![CDATA[United States Geological Survey Professional Paper]]></source>
<year>1966</year>
<volume>393</volume>
</nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gill]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Arrangement of the Families of the Mollusks]]></article-title>
<source><![CDATA[Smithsonian Miscellaneous Collections]]></source>
<year>1871</year>
<volume>227</volume>
<page-range>49</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Goldhammer]]></surname>
<given-names><![CDATA[R.K.]]></given-names>
</name>
<name>
<surname><![CDATA[Johnson]]></surname>
<given-names><![CDATA[C.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Middle Jurassic-Upper Cretaceous paleogeographic evolution and sequence-stratigraphic framework of the northwest Gulf of Mexico rim]]></article-title>
<source><![CDATA[American Association of Petroleum Geologists Memoir]]></source>
<year>2001</year>
<volume>75</volume>
<page-range>45-81</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Grossouvre]]></surname>
<given-names><![CDATA[A. de]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Recherches sur la Craie Supérieure, 2, Paléontologie. Les ammonites de la Craie Supérieure]]></article-title>
<source><![CDATA[Mémoirs pour Servir à l&#8217;Explication de la Carte géologique détaillée de la France]]></source>
<year>1894</year>
<page-range>264</page-range><publisher-loc><![CDATA[Paris ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hauer]]></surname>
<given-names><![CDATA[F. von]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Über die Cephalopoden der Gosauschichten]]></article-title>
<source><![CDATA[Beiträge zur Paläontologie von Österreich]]></source>
<year>1858</year>
<volume>1</volume>
<page-range>7-14</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Henderson]]></surname>
<given-names><![CDATA[R.A.]]></given-names>
</name>
<name>
<surname><![CDATA[McNamara]]></surname>
<given-names><![CDATA[K.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Maastrichtian non-heteromorph ammonites from the Miria Formation, Western Australia]]></article-title>
<source><![CDATA[Palaeontology]]></source>
<year>1985</year>
<volume>28</volume>
<page-range>35-88</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hoepen]]></surname>
<given-names><![CDATA[E.C.N. van]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Cretaceous Cephalopoda from Pondoland]]></article-title>
<source><![CDATA[Annals of the Transvaal Museum]]></source>
<year>1921</year>
<volume>8</volume>
<page-range>1-48</page-range></nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hupsch]]></surname>
<given-names><![CDATA[J.W.C.A.F.]]></given-names>
</name>
</person-group>
<source><![CDATA[Neue in der Naturgeschichte des Nieder-deutschlands gemachte Entdeckungen einiger selten und wenig bekannten versteinerten Schalthiere]]></source>
<year>1768</year>
<page-range>159</page-range><publisher-loc><![CDATA[Frankfurt ]]></publisher-loc>
<publisher-name><![CDATA[Metternischische Buchhandlung]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hyatt]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Genesis of the Arietidae: Smithsonian Contributions to Knowledge]]></source>
<year>1889</year>
<page-range>238</page-range><publisher-loc><![CDATA[Washington, DC ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hyatt]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Cephalopoda]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Zittel]]></surname>
<given-names><![CDATA[K.A. von]]></given-names>
</name>
</person-group>
<source><![CDATA[Textbook of Palaeontology]]></source>
<year>1900</year>
<page-range>502-604</page-range><publisher-loc><![CDATA[London &amp; New York ]]></publisher-loc>
<publisher-name><![CDATA[Macmillan]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ifrim]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Stinnesbeck]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[López-Oliva]]></surname>
<given-names><![CDATA[J.G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Maastrichtian cephalopods from Cerralvo, north-eastern Mexico]]></article-title>
<source><![CDATA[Palaeontology]]></source>
<year>2004</year>
<volume>47</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>1575-627</page-range></nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jacobs]]></surname>
<given-names><![CDATA[D.K.]]></given-names>
</name>
<name>
<surname><![CDATA[Chamberlain]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Buoyancy and hydrodynamics in ammonoids]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Landman]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Tanabe]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Davis]]></surname>
<given-names><![CDATA[R.A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Ammonoid Paleobiology]]></source>
<year>1996</year>
<volume>13</volume>
<page-range>169-224</page-range><publisher-loc><![CDATA[New York, London, Plenum Press ]]></publisher-loc>
<publisher-name><![CDATA[Topics in Paleobiology]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B33">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kauffman]]></surname>
<given-names><![CDATA[E.G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Cretaceous Bivalvia]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Hallam]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Atlas of Paleobiogeography]]></source>
<year>1973</year>
<page-range>353-83</page-range><publisher-loc><![CDATA[Amsterdam ]]></publisher-loc>
<publisher-name><![CDATA[Elsevier]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B34">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Keller]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[López-Oliva]]></surname>
<given-names><![CDATA[J.G.]]></given-names>
</name>
<name>
<surname><![CDATA[Stinnesbeck]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Adatte]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Age, stratigraphy, and deposition of near-K/T siliciclastic deposits in Mexico: Relation to bolide impact?]]></article-title>
<source><![CDATA[Geological Society of America Bulletin]]></source>
<year>1997</year>
<volume>109</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>410-28</page-range></nlm-citation>
</ref>
<ref id="B35">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kennedy]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The ammonite fauna of the Calcaire à Baculites (Upper Maastrichtian) of the Cotentin Peninsula (Manche, France)]]></article-title>
<source><![CDATA[Palaeontology]]></source>
<year>1986</year>
<volume>29</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>25-83</page-range></nlm-citation>
</ref>
<ref id="B36">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kennedy]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Cobban]]></surname>
<given-names><![CDATA[W.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Ammonites from the Saratoga Chalk (Upper Cretaceous), Arkansas]]></article-title>
<source><![CDATA[Journal of Paleontology]]></source>
<year>1993</year>
<volume>67</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>404-34</page-range></nlm-citation>
</ref>
<ref id="B37">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kennedy]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Cobban]]></surname>
<given-names><![CDATA[W.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Maastrichtian ammonites from the Corsicana Formation in northeast Texas]]></article-title>
<source><![CDATA[Geological Magazine]]></source>
<year>1993</year>
<volume>130</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>57-67</page-range></nlm-citation>
</ref>
<ref id="B38">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kennedy]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Cobban]]></surname>
<given-names><![CDATA[W.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Maastrichtian ammonites from the Hornerstown Formation in New Jersey]]></article-title>
<source><![CDATA[Journal of Paleontology]]></source>
<year>1996</year>
<volume>70</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>798-804</page-range></nlm-citation>
</ref>
<ref id="B39">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kennedy]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Cobban]]></surname>
<given-names><![CDATA[W.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Maastrichtian (Late Cretaceous) ammonites from the Owl Creek Formation on northeastern Missisippi, U.S.A.]]></article-title>
<source><![CDATA[Acta Geologica Polonica]]></source>
<year>2000</year>
<volume>50</volume>
<page-range>175-90</page-range></nlm-citation>
</ref>
<ref id="B40">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kennedy]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Summesberger]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Lower Maastrichtian ammonites from Neuberg, Steirmark, Austria]]></article-title>
<source><![CDATA[Beiträge zur Paläontologie von Österreich]]></source>
<year>1986</year>
<volume>12</volume>
<page-range>181-242</page-range></nlm-citation>
</ref>
<ref id="B41">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kennedy]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Landman]]></surname>
<given-names><![CDATA[N. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Cobban]]></surname>
<given-names><![CDATA[W.A.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Maastrichtian ammonites Coahuilites sheltoni Böse, 1928, and Sphenodiscus pleurisepta (Conrad, 1857), from the uppermost Pierre Shale and basal Fox Hills Formation of Colorado and Wyoming]]></source>
<year>1996</year>
<volume>3186</volume>
<page-range>1-14</page-range><publisher-name><![CDATA[American Museum Novitates]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B42">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kennedy]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Landman]]></surname>
<given-names><![CDATA[N. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Cobban]]></surname>
<given-names><![CDATA[W.A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Maastrichtian ammonites from the Severn Formation of Maryland]]></source>
<year>1997</year>
<volume>3210</volume>
<page-range>1-30</page-range><publisher-name><![CDATA[American Museum Novitates]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B43">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kennedy]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Landman]]></surname>
<given-names><![CDATA[N. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Cobban]]></surname>
<given-names><![CDATA[W.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Johnson]]></surname>
<given-names><![CDATA[R.O.]]></given-names>
</name>
</person-group>
<source><![CDATA[Additions to the ammonite fauna of the Upper Cretaceous Navesinsk Formation of New Jersey]]></source>
<year>2000</year>
<volume>3306</volume>
<page-range>1-30</page-range><publisher-name><![CDATA[American Museum Novitates]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B44">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kossmat]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Untersuchungen über die Südindische Kreideformation. Erster Theil]]></article-title>
<source><![CDATA[Beiträge zur Paläontologie Österreich-Ungarns und des Orient]]></source>
<year>1895</year>
<volume>9</volume>
<page-range>97-203</page-range></nlm-citation>
</ref>
<ref id="B45">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lamarck]]></surname>
<given-names><![CDATA[J.B.P.A.M. de]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Prodrome d&#8217;une nouvelle classification des coquilles]]></article-title>
<source><![CDATA[Mémoirs du Musée de l&#8217;Histoire Naturelle]]></source>
<year>1799</year>
<page-range>63-90</page-range></nlm-citation>
</ref>
<ref id="B46">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lamarck]]></surname>
<given-names><![CDATA[J.B.P.A.M. de]]></given-names>
</name>
</person-group>
<source><![CDATA[Système des Animaux sans Vertebrés]]></source>
<year>1801</year>
<page-range>432</page-range><publisher-loc><![CDATA[Paris ]]></publisher-loc>
<publisher-name><![CDATA[Deterville]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B47">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Landman]]></surname>
<given-names><![CDATA[N. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Cobban]]></surname>
<given-names><![CDATA[W.A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Ammonites from the upper part of the Pierre Shale and Fox Hills Formation of Colorado]]></source>
<year>2003</year>
<volume>3388</volume>
<page-range>1-45</page-range><publisher-name><![CDATA[American Museum Novitates]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B48">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lawton]]></surname>
<given-names><![CDATA[T.F.]]></given-names>
</name>
<name>
<surname><![CDATA[Vega]]></surname>
<given-names><![CDATA[F.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Giles]]></surname>
<given-names><![CDATA[K.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Rosales -Domínguez]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Stratigraphy and origin of the La Popa Basin, Nuevo León and Coahuila, Mexico]]></article-title>
<source><![CDATA[American Association of Petroleum Geologists Memoir]]></source>
<year>2001</year>
<volume>75</volume>
<page-range>219-40</page-range></nlm-citation>
</ref>
<ref id="B49">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Keller]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Diversification and extinction in Campanian- Maastrichtian planktic foraminifera of Northwestern Tunesia]]></article-title>
<source><![CDATA[Eclogae Geologicae Helveticae]]></source>
<year>1998</year>
<volume>91</volume>
<page-range>75-102</page-range></nlm-citation>
</ref>
<ref id="B50">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Keller]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Maastrichtian climate, productivity and faunal turnovers in planctic foraminifera on South Atlantic DSDP sites 525A and 21]]></article-title>
<source><![CDATA[Marine Micropaleontology]]></source>
<year>1998</year>
<volume>33</volume>
<page-range>55-86</page-range></nlm-citation>
</ref>
<ref id="B51">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Keller]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Stinnesbeck]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The late Campanian and Maastrichtian in northwestern Tunisia: paleonvironmental inferences from lithology, macrofauna and benthic foraminifera]]></article-title>
<source><![CDATA[Cretaceous Research]]></source>
<year>1999</year>
<volume>20</volume>
<page-range>231-52</page-range></nlm-citation>
</ref>
<ref id="B52">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Matsumoto]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A short note on the Japanese Phylloceratidae]]></article-title>
<source><![CDATA[Proceedings of the Imperial Academy Tokyo]]></source>
<year>1942</year>
<volume>18</volume>
<page-range>674-6</page-range></nlm-citation>
</ref>
<ref id="B53">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[McBride]]></surname>
<given-names><![CDATA[E.F.]]></given-names>
</name>
<name>
<surname><![CDATA[Weidie]]></surname>
<given-names><![CDATA[A.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Wolleben]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Laudon]]></surname>
<given-names><![CDATA[R.C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Stratigraphy and Structure of the Parras and La Popa Basins, northeastern Mexico]]></article-title>
<source><![CDATA[Geological Society of America Bulletin]]></source>
<year>1974</year>
<volume>85</volume>
<numero>10</numero>
<issue>10</issue>
<page-range>1603-22</page-range></nlm-citation>
</ref>
<ref id="B54">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Medina-Barrera]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Stinnesbeck]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Primer Registro de Nostoceras (Cephalopoda: Ammonoidea) del Noreste de México]]></article-title>
<source><![CDATA[Actas de la Facultad de las Ciencias de la Tierra de la Universidad Autónoma de Nuevo León]]></source>
<year>1993</year>
<volume>8</volume>
<page-range>65-70</page-range></nlm-citation>
</ref>
<ref id="B55">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Meek]]></surname>
<given-names><![CDATA[F.B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Preliminary paleontological report, consistuing of lists of fossils, with descriptions of some new type, etc]]></article-title>
<source><![CDATA[United States Geological Survey of Wyoming (Hayden), Preliminary Report]]></source>
<year>1871</year>
<volume>4</volume>
<page-range>287-318</page-range></nlm-citation>
</ref>
<ref id="B56">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Meek]]></surname>
<given-names><![CDATA[F.B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A report on the invertebrate Cretaceous and Tertiary fossils of the upper Missouri country]]></article-title>
<source><![CDATA[Report of the United States Geological Survey of the Territories]]></source>
<year>1876</year>
<volume>9</volume>
<page-range>29</page-range></nlm-citation>
</ref>
<ref id="B57">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Morton]]></surname>
<given-names><![CDATA[S.G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Synopsis of the Organic Remains of the Cretaceous Group of the United States]]></source>
<year>1834</year>
<page-range>88</page-range><publisher-loc><![CDATA[Philadelphia ]]></publisher-loc>
<publisher-name><![CDATA[Key &amp; Biddle]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B58">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Myers]]></surname>
<given-names><![CDATA[R.L.]]></given-names>
</name>
</person-group>
<source><![CDATA[Biostratigraphy of the Cardenas Formation (Upper Cretaceous) San Luis Potosí, Mexico]]></source>
<year>1968</year>
<volume>24</volume>
<page-range>89</page-range><publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología, Paleontología Mexicana]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B59">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Odin]]></surname>
<given-names><![CDATA[G.S.]]></given-names>
</name>
<name>
<surname><![CDATA[Lamaurelle]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The global Campanian-Maastrichtian stage boundary]]></article-title>
<source><![CDATA[Episodes]]></source>
<year>2001</year>
<volume>24</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>229-38</page-range></nlm-citation>
</ref>
<ref id="B60">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Olsson]]></surname>
<given-names><![CDATA[A.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Contributions to the paleontology of northern Peru. Part VII. The Cretaceous of the Paita region]]></article-title>
<source><![CDATA[Bulletins of American Paleontology]]></source>
<year>1944</year>
<volume>28</volume>
<numero>111</numero>
<issue>111</issue>
<page-range>6-147</page-range></nlm-citation>
</ref>
<ref id="B61">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Owen]]></surname>
<given-names><![CDATA[D.D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Report of a Geological Survey of Wisconsis, Iowa, and Minnesota, and incidentally of a portion of Nebraska Territory]]></source>
<year>1852</year>
<page-range>638</page-range><publisher-loc><![CDATA[Philadelphia, Lippincott ]]></publisher-loc>
<publisher-name><![CDATA[Grambo &amp; Co.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B62">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Phillips]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Illustrations of the Geology of Yorkshire or a Description of the Strata and Organic Remains of the Yorkshire Coast]]></source>
<year>1829</year>
<page-range>192</page-range><publisher-loc><![CDATA[York ]]></publisher-loc>
<publisher-name><![CDATA[York, Thomas Wilson]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B63">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Redtenbacher]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Die Cephalopodenfauna der Gosauschichten in den nordöstlichen Alpen]]></article-title>
<source><![CDATA[Abhandlungen der königlich-kaiserlichen geologischen Reichsanstalt]]></source>
<year>1873</year>
<volume>5</volume>
<page-range>91-140</page-range></nlm-citation>
</ref>
<ref id="B64">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Say]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Observations on some species of zoophytes, shells, etc, principally fossil]]></article-title>
<source><![CDATA[American Journal of Science]]></source>
<year>1820</year>
<volume>2</volume>
<page-range>34-45</page-range></nlm-citation>
</ref>
<ref id="B65">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Schafhauser]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Götz]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Baron-Szabo]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Stinnesbeck]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Depositional environment of coral-rudist associations in the Upper Cretaceous Cardenas Formation (central Mexico)]]></article-title>
<source><![CDATA[Geologia Croatica]]></source>
<year>2003</year>
<volume>56</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>187-98</page-range></nlm-citation>
</ref>
<ref id="B66">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Seunes]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Contributions à l&#8217;étude des Céphalopodes du Crétacé Supérieur de France. Ammonites du Calcaire à Baculites du Cotenin (Suite); II. Ammonites du Campanien de la région sous-Pyrénéenne, Département de Landes]]></article-title>
<source><![CDATA[Mémoirs de la Société Géologique de France, Paléontologie, 2 (Mémoir 2)]]></source>
<year>1891</year>
<page-range>8-22</page-range></nlm-citation>
</ref>
<ref id="B67">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Shumard]]></surname>
<given-names><![CDATA[B.F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Descriptions of new Cretaceous fossils from Texas]]></article-title>
<source><![CDATA[Boston Society of Natural History Proceedings]]></source>
<year>1861</year>
<volume>8</volume>
<page-range>188-205</page-range></nlm-citation>
</ref>
<ref id="B68">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sohl]]></surname>
<given-names><![CDATA[N.F.]]></given-names>
</name>
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[R.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Salmeron-Ureña]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Soto-Jaramillo]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Upper Cretaceous]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Salvador]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Gulf of Mexico Basin: Boulder, Colorado]]></source>
<year>1991</year>
<page-range>205-15</page-range></nlm-citation>
</ref>
<ref id="B69">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Spath]]></surname>
<given-names><![CDATA[L.F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[On the Senonian ammonite fauna of Pondoland]]></article-title>
<source><![CDATA[Transactions of the Royal Society of South Africa]]></source>
<year>1922</year>
<volume>10</volume>
<page-range>113-48</page-range></nlm-citation>
</ref>
<ref id="B70">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Spath]]></surname>
<given-names><![CDATA[L.F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[On new ammonites from the English Chalk]]></article-title>
<source><![CDATA[Geological Magazine]]></source>
<year>1926</year>
<volume>3</volume>
<page-range>77-83</page-range></nlm-citation>
</ref>
<ref id="B71">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stephenson]]></surname>
<given-names><![CDATA[L.W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The larger invertebrates of the Navarro Group of Texas (exclusive of corals and crustaceans and exclusive of the fauna of the Escondido Formation)]]></article-title>
<source><![CDATA[University of Texas Bulletin]]></source>
<year>1941</year>
<volume>4101</volume>
<page-range>641</page-range></nlm-citation>
</ref>
<ref id="B72">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stephenson]]></surname>
<given-names><![CDATA[L.W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Owl Creek (Upper Cretaceous) fossils from Crowleys Ridge, Southeastern Missouri]]></article-title>
<source><![CDATA[United States Geological Survey Professional Paper]]></source>
<year>1955</year>
<volume>274</volume>
</nlm-citation>
</ref>
<ref id="B73">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stinnesbeck]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Zu den faunistischen und palökologischen Verhältnissen in der Quriquina Formation (Maastrichtium) Zentral-Chiles]]></article-title>
<source><![CDATA[Palaeontographica]]></source>
<year>1986</year>
<numero>4-6</numero>
<issue>4-6</issue>
<page-range>99-237</page-range></nlm-citation>
</ref>
<ref id="B74">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stinnesbeck]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Keller]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Adatte]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Lopez-Oliva]]></surname>
<given-names><![CDATA[J.G.]]></given-names>
</name>
<name>
<surname><![CDATA[MacLeod]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Cretaceous-Teriary boundary clastic deposits in northeastern Mexico: Impact Tsunami or sea-level lowstand?]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[MacLeod]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Keller]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Cretaceous-Tertiary Mass Extinctions]]></source>
<year>1996</year>
<page-range>471-517</page-range><publisher-loc><![CDATA[New York, London ]]></publisher-loc>
<publisher-name><![CDATA[W.W. Norton &amp; Co.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B75">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stinnesbeck]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Schulte]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Lindenmaier]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Adatte]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Affolter]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Schilli]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Keller]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Stüben]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Berner]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Kramar]]></surname>
<given-names><![CDATA[U.]]></given-names>
</name>
<name>
<surname><![CDATA[Burns]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[López-Oliva]]></surname>
<given-names><![CDATA[J.-G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Late Maastrichtian age of spherule deposits in northeastern Mexico: Implication for Chicxulub scenario]]></article-title>
<source><![CDATA[Canadian Journal of Earth Sciences]]></source>
<year>2001</year>
<volume>38</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>229-38</page-range></nlm-citation>
</ref>
<ref id="B76">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tuomey]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Description of some new fossils from the Cretaceous rocks of the Southern States]]></article-title>
<source><![CDATA[Proceedings of the Academy of Natural Sciences Philadelphia]]></source>
<year>1854</year>
<volume>7</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>167-72</page-range></nlm-citation>
</ref>
<ref id="B77">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vega]]></surname>
<given-names><![CDATA[F.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Feldmann]]></surname>
<given-names><![CDATA[R.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Sour-Tovar]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Fossil Crabs (Crustacea: Decapoda) from the Late Cretaceous Cárdenas Formation, east-central Mexico]]></article-title>
<source><![CDATA[Journal of Paleontology]]></source>
<year>1995</year>
<volume>69</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>340-50</page-range></nlm-citation>
</ref>
<ref id="B78">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vega-Vera]]></surname>
<given-names><![CDATA[F.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Perrilliat]]></surname>
<given-names><![CDATA[M.C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Moluscos del Maastrichtiano de la Sierra de la Antrisco, estado de Nuevo León]]></article-title>
<source><![CDATA[Paleontología Mexicana]]></source>
<year>1990</year>
<volume>55</volume>
<page-range>42</page-range></nlm-citation>
</ref>
<ref id="B79">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Walaszczyk]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Cobban]]></surname>
<given-names><![CDATA[W.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Harries]]></surname>
<given-names><![CDATA[P.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Inoceramids and inoceramid biostratigraphy of the Campanian and Maastrichtian of the United States Western Interior Basin]]></article-title>
<source><![CDATA[Revue de Paléobiologie]]></source>
<year>2001</year>
<volume>20</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>117-234</page-range></nlm-citation>
</ref>
<ref id="B80">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ward]]></surname>
<given-names><![CDATA[P.D.]]></given-names>
</name>
<name>
<surname><![CDATA[Kennedy]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Maastrichtian ammonites from the Biscay Region]]></article-title>
<source><![CDATA[Journal of Paleontology]]></source>
<year>1993</year>
<page-range>1-58</page-range></nlm-citation>
</ref>
<ref id="B81">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Weidie]]></surname>
<given-names><![CDATA[A.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Murray]]></surname>
<given-names><![CDATA[G.E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Geology of Parras Basin and adjacent areas of northeastern Mexico]]></article-title>
<source><![CDATA[American Association of Petroleum Geologists Bulletin]]></source>
<year>1967</year>
<volume>51</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>678-95</page-range></nlm-citation>
</ref>
<ref id="B82">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Weidie]]></surname>
<given-names><![CDATA[A.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Wolleben]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
<name>
<surname><![CDATA[McBride]]></surname>
<given-names><![CDATA[E.F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Late Cretaceous depositional systems in northeastern Mexico]]></article-title>
<source><![CDATA[Transactions of the Gulf Coast Association of Geological Societies]]></source>
<year>1972</year>
<volume>22</volume>
<page-range>323-9</page-range></nlm-citation>
</ref>
<ref id="B83">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wetzel]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Die Quiriquina-Schichten als Sediment und paläontologisches Archiv]]></article-title>
<source><![CDATA[Palaeontographica]]></source>
<year>1930</year>
<volume>73</volume>
<page-range>49-104</page-range></nlm-citation>
</ref>
<ref id="B84">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wiedmann]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Stammesgeschichte und System der posttriadischen Ammonoideen; ein Überblick]]></article-title>
<source><![CDATA[Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen]]></source>
<year>1966</year>
<volume>125</volume>
<page-range>49-78</page-range></nlm-citation>
</ref>
<ref id="B85">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wolleben]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Paleontology of the Difunta Group (Upper Cretacous- Tertiary) in northeastern Mexico]]></article-title>
<source><![CDATA[Journal of Paleontology]]></source>
<year>1977</year>
<volume>51</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>373-98</page-range></nlm-citation>
</ref>
<ref id="B86">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wright]]></surname>
<given-names><![CDATA[C.W.]]></given-names>
</name>
<name>
<surname><![CDATA[Calloman]]></surname>
<given-names><![CDATA[J.H.]]></given-names>
</name>
<name>
<surname><![CDATA[Howarth]]></surname>
<given-names><![CDATA[M.K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Cretaceous Ammonoidea, Treatise of Invertebrate Paleontology, Part L, Mollusca 4]]></article-title>
<source><![CDATA[University of Kansas and Geological Society of America]]></source>
<year>1996</year>
<page-range>362</page-range></nlm-citation>
</ref>
<ref id="B87">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zittel]]></surname>
<given-names><![CDATA[K.A. von]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Cephalopoda]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Zittel]]></surname>
<given-names><![CDATA[K.A. von]]></given-names>
</name>
</person-group>
<source><![CDATA[Handbuch der Paläontologie]]></source>
<year>1884</year>
<volume>3</volume>
<page-range>329-522</page-range></nlm-citation>
</ref>
<ref id="B88">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zittel]]></surname>
<given-names><![CDATA[K.A. von]]></given-names>
</name>
</person-group>
<source><![CDATA[Grundzüge der Paläontologie]]></source>
<year>1895</year>
<page-range>971</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
