<?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>S1405-33222017000300691</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2017v69n3a10</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Field guide to the Jurassic Otlaltepec and Tezoatlán Basins, southern Mexico: sedimentological and paleontological records of Puebla and Oaxaca]]></article-title>
<article-title xml:lang="es"><![CDATA[Dos cañones a través del Jurásico: registros sedimentológicos y paleontológicos de Puebla y Oaxaca, sur de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martini]]></surname>
<given-names><![CDATA[Michelangelo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velasco-de León]]></surname>
<given-names><![CDATA[Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zepeda-Martínez]]></surname>
<given-names><![CDATA[Mildred]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lozano-Carmona]]></surname>
<given-names><![CDATA[Diego E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Calderón]]></surname>
<given-names><![CDATA[Mónica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Zaragoza ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Posgrado 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>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>691</fpage>
<lpage>709</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222017000300691&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222017000300691&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222017000300691&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract By early Mesozoic time, a major plate reorganization produced the breakup of Pangea, which was the most recent supercontinent assembled on Earth. Due to its paleogeographic position along the emergent plate boundary between North and South America, the early Mesozoic tectonic history of Mexico was dominated by the development of major normal to strike-slip faults. These faults produced a complex crustal configuration characterized by subsiding basins bounded by exhuming basement highs. Voluminous, continental to marine sedimentary successions were accumulated into these basins during the Jurassic, representing a unique stratigraphic record related to the fragmentation of the western equatorial margin of this supercontinental mass. This field trip will provide an overview of the Otlaltepec and Tezoatlán Jurassic Basins that are exposed in the states of Puebla and Oaxaca, southern Mexico. Observed outcrops are exposed along two amazing canyons and consist of alluvial-fluvial to marine clastic deposits. Major provenance changes are recorded in the Jurassic successions of the Otlaltepec and Tezoatlán Basins and are interpreted as the result of exhumation of different fault-bounded lithospheric blocks during Pangea breakup. The integration of petrological and paleontological data indicates that these major changes in provenance of clastic rocks match with changes in climatic conditions. Therefore, in this field trip, we will have the opportunity to explore the hypothesis that the progressive exhumation of lithospheric blocks during the fragmentation of Pangea could have produced major topographic changes that favored local variations in climatic conditions and consequently, the diversification of floral assemblages in Mexico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen A partir del inicio del Mesozoico, una reorganización de las placas tectónicas a escala global determinó la fragmentación de Pangea, la cual fue el supercontinente más reciente que se ensambló en la Tierra. Durante este evento tectónico global, el territorio mexicano ocupaba una posición de particular interés, ya que se encontraba en el límite de placa entre Norte y Sur América. Debido a dicha posición paleogeográfica, la evolución geológica de México durante el Mesozoico temprano fue controlada por la actividad de fallas normales y laterales, que determinaron una configuración cortical compleja y caracterizada por numerosas cuencas subsidentes bordeadas por altos de basamento en exhumación. Durante el Jurásico, las cuencas generadas por este evento tectónico fueron los sitios de depósito de potentes sucesiones continentales a marinas, las cuales representan un registro estratigráfico único de la fragmentación de la Pangea en su margen occidental-ecuatorial. Durante esta excursión, los participantes visitarán las cuencas jurásicas de Otlaltepec y Tezoatlán, las cuales están expuestas en los estados de Puebla y Oaxaca, al sur de México. Las dos barrancas que se visitarán contienen afloramientos bien expuestos de sucesiones clásticas aluviales-fluviales y marinas. Las sucesiones jurásicas de las Cuencas de Otlaltepec y Tezoatlán preservan claras evidencias de cambios en la procedencia de las rocas clásticas. Dichos cambios en la procedencia han sido interpretados como el resultado de la exhumación de diferentes bloques litosféricos a lo largo de fallas mayores durante el progresivo rompimiento de Pangea. La integración de los datos petrológicos y paleontológicos indica que estos cambios en la procedencia coinciden con cambios importantes en las condiciones climáticas. Por ende, se aprovecha la oportunidad de esta excursión para explorar la hipótesis que el proceso de exhumación de bloques litosféricos que acompañó el progresivo rompimiento de la Pangea pudo haber determinado una reorganización sustancial en la topografía, favoreciendo variaciones climáticas locales y, consecuentemente, la diversificación de la flora en México.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Pangea breakup]]></kwd>
<kwd lng="en"><![CDATA[intra-continental rift basin]]></kwd>
<kwd lng="en"><![CDATA[southern Mexico]]></kwd>
<kwd lng="en"><![CDATA[Jurassic flora]]></kwd>
<kwd lng="es"><![CDATA[fragmentación de Pangea]]></kwd>
<kwd lng="es"><![CDATA[cuenca de rift intra-continental]]></kwd>
<kwd lng="es"><![CDATA[sur de México]]></kwd>
<kwd lng="es"><![CDATA[flora del Jurásico]]></kwd>
</kwd-group>
</article-meta>
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