<?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>S1026-87742017000200114</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Palinoflora del Plioceno-Pleistoceno recuperada de los travertinos Villa Alegría y Cerro Prieto en el Valle de Tehuacán-Cuicatlán, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Pliocene-Pleistocene Palynoflora recovered from the Villa Alegría and Cierro Prieta travertines in the Tehuacán-Cuicatlán Valley, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosales-Torres]]></surname>
<given-names><![CDATA[Sara]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Arriaga]]></surname>
<given-names><![CDATA[Elia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Bernal]]></surname>
<given-names><![CDATA[Angélica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zarate-Hernández]]></surname>
<given-names><![CDATA[María del Rocío]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valiente-Banuet]]></surname>
<given-names><![CDATA[Alfonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Márquez-García]]></surname>
<given-names><![CDATA[Antonio Zoilo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Metropolitana División de Ciencias Biológicas y de la Salud Departamento de Biología]]></institution>
<addr-line><![CDATA[Iztapalapa Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología Departamento de Paleontología]]></institution>
<addr-line><![CDATA[Coyoacán Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ecología ]]></institution>
<addr-line><![CDATA[Coyoacán Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Ciencias de la Complejidad ]]></institution>
<addr-line><![CDATA[Coyoacán Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Autónoma Metropolitana División de Ciencias Biológicas y de la Salud Departamento de Hidrobiología]]></institution>
<addr-line><![CDATA[Iztapalapa Ciudad de México]]></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>34</volume>
<numero>2</numero>
<fpage>114</fpage>
<lpage>137</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742017000200114&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742017000200114&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742017000200114&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Los conjuntos paleopalinológicos del Plioceno-Pleistoceno de los sedimentos lacustres Villa Alegría (ubicados al norte del Valle de Tehuacán-Cuicatlán) y del travertino Cerro Prieto (ubicado al sur del valle) revelan una alta diversidad de taxa. Los análisis estadísticos multivariados de conglomerados y componentes principales (ACP) muestran claras agrupaciones de elementos florísticos, los cuales sugieren que durante el Plioceno-Pleistoceno la vegetación estaba integrada a nivel regional por un bosque mesófilo de montaña (posiblemente con un sotobosque rico en Cyatheaceae), bosque de pino-encino, bosque de galería y chaparral, así como bosque tropical caducifolio. Durante el Pleistoceno, las condiciones climáticas al sur del Valle de Tehuacán-Cuicatlán fueron ligeramente más húmedas que al norte durante el Plioceno, como lo confirman los conjuntos paleopalinológicos recuperados del travertino Cerro Prieto. La vegetación en el valle se distribuía a través de un gradiente altitudinal de humedad generado por su topografía. Con base en estudios geológicos previos, el ambiente de sedimentación inferido para el travertino de Villa Alegría fue un lago saturado de carbonatos de calcio provenientes de la Sierra Mazateca y el travertino Cerro Prieto fue una zona de inundación en donde probablemente se acumularon aguas enriquecidas en carbonatos de calcio provenientes de la Formación Zapotitlán. Por biozonas de abundancia, se observó una fuerte correlación entre los sedimentos lacustres Villa Alegría y el travertino Cerro Prieto.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Using standard methods, the Pliocene-Pleistocene paleopalynological assemblages recovered from both the Villa Alegría lacustrine sediments in northern Tehuacán-Cuicatlán Valley (TCV) and the Cerro Prieto travertine in the southern portion of the TCV exhibited high taxa diversity. Clear groupings of floristic elements were observed in cluster and multivariate principal components analysis (PCA), suggesting that during the Pliocene-Pleistocene the regional vegetation comprised cloud forest (possibly containing undergrowth rich in Cyatheaceae), pine-oak forest, gallery forest, mexical and tropical deciduous forest. For the Pleistocene, paleopalynological assemblages recovered from the Cerro Prieto travertine suggest that climatic conditions were slightly colder and more humid. The distribution of vegetation harbored by the TCV followed an altitudinal moisture gradient caused by the topography. Based on previous geological studies, the sedimentation environment inferred for Villa Alegría lacustrine sediments was a lake saturated in calcium carbonate sourced from the Sierra Mazateca, while that of the Cerro Prieto travertine was a flood zone in which carbonate-saturated waters from the Zapotitlán Formation accumulated. Based on biozone abundance, strong correlation between Villa Alegría lacustrine sediments and the Cerro Prieto travertine was observed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[reconstrucción paleoflorística]]></kwd>
<kwd lng="es"><![CDATA[polen]]></kwd>
<kwd lng="es"><![CDATA[travertino]]></kwd>
<kwd lng="es"><![CDATA[sedimentos lacustres]]></kwd>
<kwd lng="es"><![CDATA[Plioceno-Pleistoceno]]></kwd>
<kwd lng="es"><![CDATA[Valle de Tehuacán-Cuicatlán]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[palaeofloristic reconstruction]]></kwd>
<kwd lng="en"><![CDATA[pollen]]></kwd>
<kwd lng="en"><![CDATA[travertine]]></kwd>
<kwd lng="en"><![CDATA[lacustrine sediments]]></kwd>
<kwd lng="en"><![CDATA[Pliocene-Pleistocene]]></kwd>
<kwd lng="en"><![CDATA[Tehuacán-Cuicatlán Valley]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
</kwd-group>
</article-meta>
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