<?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>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222018000200325</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2018v70n2a4</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Implicaciones ambientales de las trazas fósiles de la Formación Ixtaltepec, Carbonífero de Oaxaca, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Environmental implications of trace fossils from the Ixtaltepec Formation (Carboniferous) in Oaxaca, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Ocaña]]></surname>
<given-names><![CDATA[María Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiroz-Barroso]]></surname>
<given-names><![CDATA[Sara A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Posgrado en Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Departamento de Biología Evolutiva]]></institution>
<addr-line><![CDATA[04510 CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>70</volume>
<numero>2</numero>
<fpage>325</fpage>
<lpage>350</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222018000200325&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222018000200325&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222018000200325&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Una de las sucesiones más completas de rocas paleozoicas de México aflora en el sur de su territorio, en el área de Santiago Ixtaltepec, en el estado de Oaxaca. En esta sucesión, las rocas carboníferas corresponden a las formaciones Santiago (Tournaisiano Serpukhoviano) e Ixtaltepec (Serpu khoviano-Moscoviano). La Formación Ixtaltepec se ha dividido en ocho unidades (API-1 a API-8) caracterizadas por asociaciones fósiles de corales, trilobites, bivalvos, gasterópodos, braquiópodos, briozoos, ofiuroideos, crinoides y restos vegetales en diferentes proporciones. La unidad API-4 está compuesta de lutita y arenisca, en sus capas inferiores y medias contienen escasos fósiles corporales con bioturbación moderada. En el presente estudio se describen nueve icnotaxones para esta unidad: Cochlichnus anguineus, Cochlichnus isp., Lockeia siliquaria, Lockeia isp., Planolites isp., Protovirgularia isp., Rhizocorallium commune, y trazas asignables tentativamente a ?Gordia isp. y a ?Rhizocorallium isp., agrupados en tres icnoasociaciones. Estas icnoasociaciones corresponden a una icnofacies Cruziana e indican que el depósito ocurrió en la zona intermareal, en una planicie de marea entre mudflat y mixed flat, representando una etapa de somerización en esta área durante el Serpukhoviano-Bashkiriano.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract One of the most complete successions of paleozoic rocks is located at the SantiagoIxtaltepec area, in Oaxaca State, southern Mexico. In this succession, Carboniferous rocks are formed by the Santiago (Tournaisian-Serpukhovian) and the Ixtal tepec (Serpukhovian-Moscovian) formations. The Ixtaltepec Formation has been divided into eight units (API-1 to API-8) characterized by fossil associations of corals, trilobites, bivalves, gastropods, brachiopods, bryozoans, ophiuroids, crinoids and plant fragments, with different proportions. API-4 unit is composed of sandstone and shale, and their lower and medium layers contain few body fossils and show moderate bioturbation. The present study describes nine ichnotaxa collected in this unit: Cochlichnus anguineus, Cochlichnus isp., Lockeia siliquaria, Lockeia isp., Planolites isp., Protovirgularia isp., Rhizocorallium commune, and other traces, tentatively assignable to ?Gordia isp. and ?Rhizocorallium isp., which are grouped into three associations. These ichnoassociations correspond to a Cruziana icnofacies and indicate that the deposit occurred in the intertidal zone, in a tidal plain between mudflat and mixed flat, representing a shallowing stage in this area during the Serpukhovian-Bashkirian.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Icnoasociaciones]]></kwd>
<kwd lng="es"><![CDATA[tafonomía]]></kwd>
<kwd lng="es"><![CDATA[planicie de marea]]></kwd>
<kwd lng="es"><![CDATA[Carbonífero]]></kwd>
<kwd lng="es"><![CDATA[Fm. Ixtaltepec]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[Ichnoassociations]]></kwd>
<kwd lng="en"><![CDATA[taphonomy]]></kwd>
<kwd lng="en"><![CDATA[tidal flat]]></kwd>
<kwd lng="en"><![CDATA[Carbo niferous]]></kwd>
<kwd lng="en"><![CDATA[Ixtaltepec Formation]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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