<?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>S1026-87742005000100097</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caracterización de una nueva localidad fosilífera del Jurásico Inferior con crinoides y amonites en el centro-oriente de México (Temapá, Hidalgo)]]></article-title>
<article-title xml:lang="en"><![CDATA[Characterization of a new Early Jurassic fossiliferous lacality with crinoids and ammonites in eastern central Mexico (Temapá, Hidalgo)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Esquivel-Macías]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León-Olvera]]></surname>
<given-names><![CDATA[Rita G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores-Castro]]></surname>
<given-names><![CDATA[Kinardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Hidalgo Centro de Investigaciones Biológicas ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Investigadora Independiente  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Hidalgo Centro de Investigaciones en Ciencias de la Tierra ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</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>97</fpage>
<lpage>114</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742005000100097&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742005000100097&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742005000100097&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El grupo Huayacocotla es conocido por medio de diversos estudios geológicos y paleontológicos. En el presente trabajo se reporta por primera vez una fauna de amonites (Paltechioceras cf. mexicanum, P. rothpletzi, Ortechioceras incaguasiense, Coroniceras? (Metophioceras) aff. conybeari auct., Phylloceras sp., Sulciferites? cf. stenorhynchus) e isocrínidos bentónicos (Isocrinidae) y pseudoplanctónicos (Pentacrinitidae). Estos últimos representan nuevos registros para sedimentos sinemurianos de México. Se consideran los supuestos hábitos de vida para las familias a las que pertenecen las especies de amonites, como dato de referencia sobre el ambiente de depósito. En este afloramiento también se encuentra el bivalvo Posidontis semiplicata y un gasterópodo no identificado. Hay tres tipos de asociaciones fósiles que se encuentran repetidamente en las capas del afloramiento Temapá, perteneciente a la Formación Despí, de tal forma que es posible reconocerlas (1) por la diferencia de diámetro de los amonites que las componen; (2) por la diferente composición faunística entre ellas, que se demuestra con la aplicación del índice de Simpson; y (3) por el grado de fragmentación de las conchas. Junto a este último indicio se considera la distribución de tallas del conjunto de especies de amonoides para establecer un criterio de deposición in situ/deposición por arrastre para las diferentes asociaciones. El perfil donde se encuentran estos tres tipos de asociaciones consta de limolitas arenosas, con bandas intercaladas tipo &#8220;flasser-wavy&#8221; de arenisca finas en capas de espesor milimétrico. Los amonites se encuentran en ambos tipos de roca, aunque predominan los ejemplares completos y de mayor tamaño en la limonita arenosa (asociación uno), mientras que los de menor talla y aglomerados se encuentran en las areniscas finas (asociación dos); también en areniscas finas se encuentra la tercera asociación, que consta de fragmentos de amonoides mezclados con crinoides. Junto a la composición macrofaunística mencionada se presenta la descripción litológica, de petrografía sedimentaria en sección delgada y la granulometría para establecer las principales características de este afloramiento.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The general geological and paleontological aspects of the Huayacocotla Group, México have been previously investigated by other authors. We report here the first outcrop with ammonoids (Paltechioceras cf. mexicanum, P. rothpletzi, Ortechioceras incaguasiense, Coroniceras? (Metophioceras) aff. conybeari auct, Phylloceras sp., Sulciferites? cf. stenorhynchus) and isocrinids, some of them benthic (Isocrinidae) and some pseudoplanktonic (Pentacrinitidae). This is the first time the isocrinids are reported from Sinemurian sediments (Lower Jurassic) in Mexico. The supposed habitats for the families of these ammonoids are considered, in support to sedimentary environment. In this outcrop, we also identified a bivalve Posidontis semiplicata and an unidentified gastropod.  Three types of fossil assemblages are repetitively observed in the Temapá outcrop, which belongs to the Despí Formation. The types of fossil associations are identified by (1) the differences in the ammonoids diameters; (2) its faunal compositions as demonstrated by Simpson index application; and (3) by the fragmentation level of shells. Additionally, we established a criterion of deposition (in situ/transported) on the basis of size distribution. In the stratigraphic sequence with three types of associations are observed sandy siltstone with milimetric flasser-wavy layers of fine sands. The ammonoids are present in both sediments, although the largest and most complete fossils are found in the sandy siltstone (assembalge 1). The smaller ammonites are found only in the fine sand forming the assemblage two, and crinoids with fragmentary ammonoid bioclastic material, also in fine sand, compose the third assemblage. In addition to the macrofaunal associations as mentioned above, we report the lithologic description, the sedimentary petrography and grain size distribution of sediments to establish the characteristics of the Temapá outcrop.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[amonites]]></kwd>
<kwd lng="es"><![CDATA[crinoideos]]></kwd>
<kwd lng="es"><![CDATA[Sinemuriano]]></kwd>
<kwd lng="es"><![CDATA[Huayacocotla]]></kwd>
<kwd lng="es"><![CDATA[Temapá]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[ammonites]]></kwd>
<kwd lng="en"><![CDATA[crinoids]]></kwd>
<kwd lng="en"><![CDATA[Sinemurian]]></kwd>
<kwd lng="en"><![CDATA[Huayacocotla]]></kwd>
<kwd lng="en"><![CDATA[Temapá]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
</kwd-group>
</article-meta>
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