<?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>S1405-33222017000100149</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Oligocene cetaceans from Baja California Sur, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Cisneros]]></surname>
<given-names><![CDATA[Atzcalli Ehécatl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González Barba]]></surname>
<given-names><![CDATA[Gerardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fordyce]]></surname>
<given-names><![CDATA[Robert Ewan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Baja California Sur Museo de Historia Natural de la Universidad Autónoma de Baja California Sur ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Ciencias Marinas ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of Otago Department of Geology ]]></institution>
<addr-line><![CDATA[Dunedin ]]></addr-line>
<country>New Zealand</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>149</fpage>
<lpage>173</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222017000100149&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222017000100149&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222017000100149&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Baja California Sur has an important Cenozoic marine fossil record which includes diverse but poorly known Oligocene cetaceans from Mexico. Here we review the cetacean fossil record including new observations from materials that elucidate the evolution of the Neoceti in the Pacific basin. Fossils were collected from outcrops of the El Cien Formation (Oligocene-Early Miocene) and from San Gregorio Formation (Late Oligocene). The specimens belong to the paleontological collection of Museo de Historia Natural de la Universidad Autónoma de Baja California Sur. An estimated 26 unnamed species include toothed cetaceans: possible &#8220;archaeocetes&#8221; (?Kekenodontidae); archaic Odontoceti; and the basal group Aetiocetidae, toothed mysticetes (Mysticeti). Toothless mysticetes (Chaeomysticeti) include the basal group Eomysticetidae, and balaenopterids-like forms. The Oligocene cetaceans from Baja California Sur, Mexico are diverse and represent the most southern such assemblages known from North America.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Baja California Sur tiene un importante registro de fósiles marinos del Cenozoico que incluye los restos poco conocidos de cetáceos del Oligoceno de México. En este estudio ofrecemos más detalles sobre estos fósiles de cetáceos, incluyendo nuevas observaciones sobre materiales que proponen esclarecer aspectos de la evolución del grupo Neoceti dentro de la cuenca del Pacífico. Los fósiles han sido colectados de los afloramientos de la Formación El Cien (Oligoceno-Mioceno Temprano) y la Formación San Gregorio (Oligoceno Tardío). Los especímenes pertenecen a la colección paleontológica del Museo de Historia Natural de la Universidad Autónoma de Baja California Sur. Se estiman alrededor de 26 especies sin nominar que incluyen cetáceos dentados: posibles &#8220;arqueocetos&#8221; (?Kekenodontidae), odontocetos arcaicos (Odontoceti), y el grupo basal de ballenas dentadas Aetiocetidae (Mysticeti). Los misticetos barbados (Chaeomysticeti) incluyen al grupo basal Eomysticetidae y formas similares a balenopteridos. Los cetáceos del Oligoceno de Baja California Sur, México son taxonómicamente diversos y representan como tal el registro más austral conocido de Norteamérica.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Mysticeti]]></kwd>
<kwd lng="en"><![CDATA[Odontoceti]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="en"><![CDATA[fossils]]></kwd>
<kwd lng="en"><![CDATA[Late Oligocene]]></kwd>
<kwd lng="es"><![CDATA[Mysticeti]]></kwd>
<kwd lng="es"><![CDATA[Odontoceti]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="es"><![CDATA[fósiles]]></kwd>
<kwd lng="es"><![CDATA[Oligoceno Tardío]]></kwd>
</kwd-group>
</article-meta>
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