<?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>S1405-33222017000300739</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2017v69n3a12</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Paleoenvironment and biostratigraphy of the Upper Sinemurian (Lower Jurassic) of the Huayacocotla Formation in East-Central Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Paleoambiente y bioestratigrafía del Sinemuriano Superior (Jurásico Inferior) de la Formación Huayacocotla en el centro-este de México]]></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 Gabriela]]></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[,Independent researcher  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,UAEH Cuerpo Académico de Ciencias de la Tierra ]]></institution>
<addr-line><![CDATA[Pachuca Hidalgo]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>69</volume>
<numero>3</numero>
<fpage>739</fpage>
<lpage>770</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222017000300739&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222017000300739&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222017000300739&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The Lower Jurassic Huayacocotla Fm. (Upper Sinemurian), was first studied by several American and European geologist during the twentieth century (1948), whom eventually concluded that these rocks were not commercially productive. Consequently, the interest in this unit faded a long time ago. However, studies resumed in the 2000&#8217;s by Mexican researchers, this time including a wide range of paleontological, paleoenvironmental, paleoecological, geologic, and structural aspects, incorporating taphonomic, petrologic and geochemical techniques. They concluded that the Huayacocotla Fm. is not a condensed sequence, but can be better regarded as a single unit, including several facies rather than a complex unit of several formations. Today, it is well known that the Huayacocotla Fm. was deposited in a semi-restricted back arc paleobasin, with suboxic to euxinic conditions. Its protolith of igneous intermediate composition reveals tectonic features related to the Pangea collision phase and the first stages of the Gulf of Mexico opening. The paleobasin with high rate of sedimentation, generated this sequence siliciclastic, simultaneously with the process of expansion of the Gulf of Mexico. The modern biostratigraphical analyses developed in the 2000&#8217;s, accurate the biostratigraphic zonation proposed by Burckhardt and Erben. These new studies revealed that the deposition of the Huayacocotla Fm. spanned several Late Sinemurian diverse chronozones, especially Oxynotum, Densinodulum, and Raricostatum subzones. Nevertheless, some local divergences with respect to the standard biozonation were noticed, and these anomalies are tentatively explained to be the result of Early Sinemurian homotaxial events. There is a gap in the Lower Obtusum faunas, but the presence of Lower Sinemurian deposits was reported from at least one outcrop. This Jurassic field trip guide was written to lead and encourage interested researchers in this field to contribute to this subject, and maybe other related topics, as well as to encourage academic discussions about the knowledge of Early Jurassic marine paleobasins, in the context of the 10th International Jurassic Congress.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La Formación Huayacocotla del Jurásico Inferior (Sinemuriano Superior) fue estudiada por varios geólogos norteamericanos y europeos durante el siglo veinte (1948), que concluyeron que estas rocas no eran comercialmente productivas. En consecuencia el interés en ellas decayó. Durante la primera década de los 2000&#8217;s se retoma su estudio ahora en el aspecto paleontológico y paleoambiental a cargo de investigadores mexicanos, incorporando conceptos y técnicas de tafonomía, geoquímica y petrología, lo cual permitió encontrar que se trata de una secuencia desarrollada (sensu no condensada), que en principio parecía dividida en varias formaciones y que resultaron ser facies de una sola Formación. Ahora se sabe que la Fm. Huayacocotla representa una paleocuenca intrarco semirestringida, con fondos de condiciones subóxicas a euxínicas; cuyo protolito de composición ígnea intermedia delata rasgos tectónicos involucrados en la fase de colisión de la Pangea y en las primeras fases de la apertura del Golfo de México. La paleocuenca con alta tasa de sedimentación, generó esta secuencia siliciclástica, simultáneamente con el proceso de expansión que originó al Golfo de México. Desde el 2000 también se elaboraron trabajos sobre bioestratigrafía en estas localidades, que afinan la zonación bioestratigráfica indicada en términos generales por Burckhardt y Erben al principio del siglo veinte. Esto evidenció que esta secuencia se desarrolló durante las cronozonas del Sinemuriano Superior centradas alrededor de las Zonas de Oxynotum, Densinodulum y Raricostatum; sin embargo, numerosas anomalías faunísticas se explican como eventos homotaxiales relacionados al Sinemuriano Inferior, con una marcada interrupción de la fosilización durante la zona Obtusum. La presente guía se formula como apoyo para conducir en un recorrido de campo a investigadores interesados en el intercambio de información y colaboración que permitan ampliar estos conocimientos a otras secciones jurásicas, tanto de esta paleocuenca marina como del mundo, en el marco del X Congreso Jurásico Internacional.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Jurassic]]></kwd>
<kwd lng="en"><![CDATA[Sinemurian]]></kwd>
<kwd lng="en"><![CDATA[Huayacocotla]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="en"><![CDATA[Biostratigraphy]]></kwd>
<kwd lng="es"><![CDATA[Jurásico]]></kwd>
<kwd lng="es"><![CDATA[Sinemuriano]]></kwd>
<kwd lng="es"><![CDATA[Huayacocotla]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="es"><![CDATA[Bioestratigrafía]]></kwd>
</kwd-group>
</article-meta>
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