<?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>S1405-33222017000100035</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Registro paleopalinológico de la formación San Gregorio (Barreno B4), Baja California Sur, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galván-Escobedo]]></surname>
<given-names><![CDATA[Iris G.]]></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[Valiente-Banuet]]></surname>
<given-names><![CDATA[Alfonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Uscanga-Mortera]]></surname>
<given-names><![CDATA[Ebandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Moya]]></surname>
<given-names><![CDATA[Edmundo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kohashi-Shibata]]></surname>
<given-names><![CDATA[Josué]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Posgrado en Botánica ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología Dpto. de Paleontología]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ecología Departamento de Ecología de la Biodiversidad]]></institution>
<addr-line><![CDATA[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>69</volume>
<numero>1</numero>
<fpage>35</fpage>
<lpage>58</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222017000100035&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222017000100035&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222017000100035&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En la región de La Purísima, Comondú, Baja California Sur, se extrajo el barreno B4 de la formación San Gregorio (Oligoceno superior-Mioceno inferior), el cual contiene microfósiles de origen continental y marino. El objetivo de esta investigación fue estudiar los palinomorfos recuperados del barreno y analizar su riqueza y diversidad &#945;. Con base en los microfósiles continentales, se proponen los tipos de vegetación en que pudieron desarrollarse estos elementos. Así mismo, el ambiente de depósito se interpretó con base en los microfósiles marinos. La riqueza total de taxones fue de n = 189, mientras que la riqueza de los conjuntos de elementos continentales y de dinoflagelados fue n = 161 y n = 28, respectivamente. La diversidad &#945; (H&#8217;) de elementos continentales fue de 2.61 y la uniformidad (J&#8217;) fue de 0.51. La diversidad H&#8217; del conjunto de dinoflagelados fue de 2.33 y J&#8217; de 0.70. La diversidad H&#8217; del conjunto total fue de 3.02 y J&#8217; de 0.57. El análisis de agrupamiento CONISS (constrained incremental sum of squares clustering), definió tres zonas en la columna estratigráfica del barreno. La zona A, se caracterizó por la presencia de quistes de dinoflagelados de Operculodinium y la escasez de polen-esporas. La zona B, se definió por la existencia de palinomorfos continentales; destacó la presencia de polen de Chenopodipollis, Graminidites, Liliacidites y esporas de Lusatisporis dettmannae, y los quistes de dinoflagelados Achomosphaera, Lingulodinium y Polysphaeridium. La zona C, se estableció por el registro de polen de Tubulifloridites. Los taxones de importancia cronoestratigráfica fueron Corsinipollenites, Ephedripites claricristatus, Momipites coryloides y M. tenuipolus. El conjunto de polen-esporas sugiere la presencia de dos palecomunidades vegetales: a nivel regional, el bosque mesófilo de montaña en las zonas altas y, a nivel local cerca de la paleocuenca de depósito, el bosque tropical caducifolio. La presencia de palinomorfos marinos en el barreno B4 sugiere que estos depósitos corresponden a un ambiente marino somero cercano al litoral.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In La Purísima region, Comondú, Baja California Sur, the borehole B4 was extracted from the San Gregorio formation (upper Oligocene-lower Miocene). It contains continental and marine palynomorphs. The aim of this study was to examine the borehole palinomorphs and analyze their richness and &#945; diversity. We propose the vegetation types in which these elements could develop based on continental microfossils. Also the deposition environment was interpreted based on the marine microfossils. The richness for pollen-spores and dinoflagellate cysts assemblages was n = 161 and n = 28 respectively. The total richness was n = 189. The &#945;-diversity (H&#8217;) of the pollen-spores assemblage was 2.61 and the evenness (J&#8217;) was 0.51. The dinoflagellate cysts diversity H&#8217; was 2.33 and J&#8217; was 0.70. The total diversity H&#8217; was 3.02, and J&#8217; was 0.57. Using CONISS analysis (constrained incremental sum of squares clustering), three zones in the stratigraphic column of the borehole were defined. Zone A, was characterized by the presence of Operculodinium dinoflagellate cysts and a scarcity of pollen-spores. Zone B, was defined by continental palynomorphs, highlighting the presence of Chenopodipollis, Graminidites, Liliacidites pollen and Lusatisporis dettmannae spores, as well as Achomosphaera, Lingulodinium and Polysphaeridium dinoflagellates cysts. Zone C, was established by the Tubulifloridites pollen record. The chronostratigraphic pointers were: Corsinipollenites, Ephedripites claricristatus, Momipites coryloides and M. tenuipolus. The pollen-spore assemblages suggests the presence of two plant paleocommunities: a cloud forest in the highlands at the regional level, and a tropical deciduous forest at the local level near to the deposit basin. The presence of marine palynomorphs in the sequence suggest that these deposits correspond to a shallow marine environment near the coast.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[polen-esporas]]></kwd>
<kwd lng="es"><![CDATA[dinoflagelados]]></kwd>
<kwd lng="es"><![CDATA[diversidad]]></kwd>
<kwd lng="es"><![CDATA[paleovegetación]]></kwd>
<kwd lng="es"><![CDATA[formación San Gregorio]]></kwd>
<kwd lng="en"><![CDATA[pollen-spores]]></kwd>
<kwd lng="en"><![CDATA[dinoflagellates]]></kwd>
<kwd lng="en"><![CDATA[diversity]]></kwd>
<kwd lng="en"><![CDATA[paleovegetation]]></kwd>
<kwd lng="en"><![CDATA[San Gregorio formation]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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