<?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>S1026-87742016000200239</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Late Pleistocene (OIS 3) paleoenvironmental reconstruction for the Térapa vertebrate site, northcentral Sonora, Mexico, based on stable isotopes and autecology of ostracodes]]></article-title>
<article-title xml:lang="es"><![CDATA[Reconstrucción paleoambiental para el Plesitoceno tardío (OIS 3) del sitio de vertebrados fósiles Térapa en el norte-centro de Sonora, México, basada en isótopos estables y autecología de ostrácodos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bright]]></surname>
<given-names><![CDATA[Jordon]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Orem]]></surname>
<given-names><![CDATA[Caitlin A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mead]]></surname>
<given-names><![CDATA[Jim I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Baez]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Arizona Department of Geosciences ]]></institution>
<addr-line><![CDATA[Tucson AZ]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,BP Exploration (Alaska) Inc.  ]]></institution>
<addr-line><![CDATA[Anchorage AK]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,East Tennessee State University  ]]></institution>
<addr-line><![CDATA[Johnson City ]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,University of Arizona College of Agriculture and Life Sciences ]]></institution>
<addr-line><![CDATA[Tucson AZ]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<volume>33</volume>
<numero>2</numero>
<fpage>239</fpage>
<lpage>253</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742016000200239&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742016000200239&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742016000200239&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Térapa fossil vertebrate site, northcentral Sonora, Mexico, provides a rare opportunity to study the paleoenvironmental conditions present in northwestern Mexico during mid-Oxygen Isotope Stage (OIS) 3. Ostracode faun al assemblages and stable oxygen (&#948;18O) and stable carbon (&#948;13&#1057;) isotope values from ostracode calcite were used to reconstruct the seasonality of precipitation and vegetation cover at Térapa at 40-43 ka. The ostracode fauna was a non-analogue mix of temperate and tropical ostracode species composed of 13 species from 12 genera. The nearctic ostracodes Fabaeformiscandona caudata, Physocypria pustulosa, Cypridopsis vidua and the cosmopolitan ostracode Darwinula stevensoni dominate the assemblage. Two tropical ostracode genera, Chlamydotheca arcuata and Steno&#1089;&#1091;pris sp., were present throughout the deposit and indicate that mean monthly summer temperatures were probably no more than 4°C to 6°C cooler than at present, based on available ecological information. Winter precipitation dominated the hydrologie cycle as evidenced by low ostracode &#948;18O values (-6&#8240; to -8&#8240; VPDB). Low ostracode &#948;13C values (-7&#8240; to -8&#8240; VPDB) suggest that local vegetation was dominated by C3 plants. A previous tooth enamel-based paleoenvironmental reconstruction at the same site favored a summer-dominated or evaporative hydrology and abundant C4 vegetation. The Térapa megafauna site exemplifies the need for multi-indicator paleoclimate reconstructions in desert environments where marked differences in the seasonality of precipitation and vegetation cover may occur.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El sitio de vertebrados fósiles Térapa, en el norte central de Sonora, México, ofrece una rara oportunidad de estudiar las condiciones &#961; aleo am-bien tales presen tes en el noroeste de México durante la etapa isotópica de oxígeno (OIS) 3. Ensambles de fauna de ostrácodos y valores isotópicos de oxígeno estable (&#948;18O) y valores isotópicos de carbono estable (&#948;13&#1057;) de calcita en ostrácodos fueron utilizados para reconstruir la estacionalidad de la precipitación y cobertura vegetal en Térapa a los 40-43 ka. La fauna de ostrácodos fue una mezcla de diferentes especies templadas y tropicales de ostrácodos compuestas de 13 especies de 12 géneros. Los ostrácodos neárticos Fabaeformiscandona caudata, Physocypria pustulosa, Cypridopsis vidua y la ostrácoda cosmopolita Darwinula stevensoni dominan el ensamble. Dos géneros de ostrácodos tropicales, Chlamydotheca arcuata y Stenocyprís sp., estuvieron presentes durante el depósito indicando que las temperaturas promedio mensuales en verano probablemente no eran menores de 4°C a 6°C que en la actualidad, con base en información ecológica disponible. Las precipitaciones de invierno dominaron el ciclo hidrológico como lo demuestran los valores &#948;18O bajos (-6&#8240; to -8&#8240; VPDB) en ostrácodos. Los valores &#948;13C bajos (-7&#8240; to -8&#8240; VPDB) en ostrácodos sugieren que la vegetación local estaba dominada por plantas C3. Una reconstrucción &#961; aleo ambiental previa basada en esmalte de dientes en el mismo sitio favoreció una hidrología verano-dominada o de caracter ev&#1072;&#1088;oratorio y una abundante vegetación C4. El sitio de megafauna Térapa ejemplifica la necesidad de reconstruccionesa partir de varios indicadores &#961; aleo climáticos en ambientes desérticos donde pueden ocurrir diferencias marcadas en las temporadas de precipitación y cobertura vegetal.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Sonora]]></kwd>
<kwd lng="en"><![CDATA[OIS 3]]></kwd>
<kwd lng="en"><![CDATA[paleoenvironment]]></kwd>
<kwd lng="en"><![CDATA[ostracode]]></kwd>
<kwd lng="en"><![CDATA[stable isotopes]]></kwd>
<kwd lng="es"><![CDATA[Sonora]]></kwd>
<kwd lng="es"><![CDATA[OIS 3]]></kwd>
<kwd lng="es"><![CDATA[paleoambiente]]></kwd>
<kwd lng="es"><![CDATA[ostrácodo]]></kwd>
<kwd lng="es"><![CDATA[isótopos estables]]></kwd>
</kwd-group>
</article-meta>
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