<?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>S1405-33222024000300013</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2024v76n3a040424</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Age constraints on marine-fluvial deposits at Rancho La Palma, Baja California Sur, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Determinación de la edad de los depósitos marino-fluviales de Rancho La Palma, Baja California Sur, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rochín-Bañaga]]></surname>
<given-names><![CDATA[Heriberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Davis]]></surname>
<given-names><![CDATA[Donald W.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Schwennicke]]></surname>
<given-names><![CDATA[Tobias]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Cisneros]]></surname>
<given-names><![CDATA[Atzcalli E]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Toronto Department of Earth Sciences ]]></institution>
<addr-line><![CDATA[Toronto ]]></addr-line>
<country>Canada</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Baja California Sur Departamento de Ciencias de la Tierra ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Ciencias Marinas ]]></institution>
<addr-line><![CDATA[La Paz ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>76</volume>
<numero>3</numero>
<fpage>0</fpage>
<lpage>0</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222024000300013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222024000300013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222024000300013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Coastal marine and fluvial deposits, exposed at Cerro El Divisadero near Rancho La Palma, Baja California Sur, Mexico, contain a fossil record of cetaceans (baleen whales). U Pb zircon dating of a tuff horizon collected near the base of Cerro El Divisadero yields a 206Pb/238U age of 27.95 ± 0.16 Ma. This suggests that the marine and fluvial beds at the Rancho La Palma locality are late Rupelian in age and not lower Miocene as previously reported. Therefore, the marine deposits from the Cerro El Divisadero section can be correlated with the Oligocene El Cien Formation at San Juan de La Costa and are contemporaneous with the middle part of its San Juan Member, representing a marginal facies of this unit. Our results constrain the age of the baleen whales found at the Cerro El Divisadero section, providing clues for Oligocene cetacean evolution in the North Pacific.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Depósitos marinos costeros y fluviales, expuestos en el Cerro El Divisadero cerca del Rancho La Palma, Baja California Sur, México, contienen registro fósil de cetáceos (ballenas barbadas). La datación de circones de una toba recolectada cerca de la base del Cerro El Divisadero arrojó una edad de 206Pb/238U de 27.95 ± 0.16 Ma. Esto sugiere que las capas marinas y fluviales que afloran en la localidad Rancho La Palma son de edad Rupeliano y no del Mioceno temprano como se reportó anteriormente. Por lo tanto, los depósitos marinos del Cerro El Divisadero pertenecen a la Formación El Cien la cual aflora en San Juan de La Costa y son contemporáneos a la parte media del Miembro San Juan, representando una posible facies marginal de esta unidad. Nuestros resultados restringen la edad de los fósiles de ballenas barbadas recolectados en la sección Cerro El Divisadero, proporcionando pistas sobre la evolución de los cetáceos del Oligoceno en el Pacífico Norte.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[marine-fluvial stratigraphy]]></kwd>
<kwd lng="en"><![CDATA[U-Pb geochronology]]></kwd>
<kwd lng="en"><![CDATA[zircon dating]]></kwd>
<kwd lng="es"><![CDATA[estratigrafía marina - fluvial]]></kwd>
<kwd lng="es"><![CDATA[U-Pb geocronología]]></kwd>
<kwd lng="es"><![CDATA[datación de circones]]></kwd>
</kwd-group>
</article-meta>
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