<?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>S1405-33222024000100010</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2024v76n1a300124</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Calpionélidos en una sucesión vulcano-sedimentaria en Guanaceví, Durango, occidente de México]]></article-title>
<article-title xml:lang="en"><![CDATA[Calpionellids in a volcano-sedimentary succession in Guanaceví, Durango, western Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Eguiluz y de Antuñano]]></surname>
<given-names><![CDATA[Samuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Martínez]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Rinconada Precolombina  ]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Laboratorio de Carbonatos y Procesos Kársticos ]]></institution>
<addr-line><![CDATA[CDMX ]]></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>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222024000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222024000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222024000100010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En Guanaceví, Durango, trabajos previos describen una sucesión vulcano-sedimentaria referida como Complejo Volcánico Inferior. En esta sucesión se reportó Calpionella alpina, Calpionella elliptica y Tintinnopsella carpathica, en estratos de caliza considerados del Berriasiano Medio. La localidad de este hallazgo es imprecisa y no se aportaron pruebas taxonómicas de los microfósiles para constatar su presencia en rocas de esta edad en el occidente de México. El presente trabajo tiene como objetivo ofrecer evidencia taxonómica del conjunto fosilífero compuesto por Chitinoidella sp., Crassicollaria sp., Crassicollaria massutinianna, Remaniella sp. y Tintinnopsella carpathica, del Tithoniano tardío y Berriasiano temprano, así mismo, se da la ubicación precisa de las localidades fosilíferas. La presencia del conjunto fosilífero tratado aquí, aunado a reportes previos sobre la existencia relativamente cercana de Crassicollaria massutinianna, extiende la distribución de los calpionélidos, de entorno tetisiano, al margen Pacífico Boreal en el occidente de México. La sucesión estratigráfica en la que se encuentran los fósiles está formada, en la base por conglomerado polimíctico inmaduro, que pasa de forma gradual hacia arenisca, lutita y caliza, con toba y derrames de andesita intercalados. Estas litologías posiblemente representan una transgresión, que pasa de facies continental a litoral marginal y marino profundo, con vulcanismo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT In Guanaceví, Durango, previous works describe a volcano-sedimentary succession referred to as the Lower Volcanic Complex. In this succession, Calpionella alpina, Calpionella elliptica and Tintinnopsella carpathica were reported in limestone strata considered to be from the Middle Berriasian. The locality of this find is imprecise, and no taxonomic evidence of the microfossils was provided to verify their presence in rocks of this age in western Mexico. The objective of this work is to offer taxonomic evidence of the fossiliferous assemblage composed of Chitinoidella sp., Crassicollaria sp., Crassicollaria massutinianna, Remaniella sp., and Tintinnopsella carp a thica, from the late Tithonian to the early Berriasian, likewise, the precise location of the fossiliferous localities is given. The presence of the fossiliferous assemblage treated here, together with previous reports on the relatively close existence of Crassicollaria massutinianna, extends the distribution of calpionellids, from a Tethyan environment to the Boreal Pacific realm in western Mexico. The stratigraphic succession in which the fossils are found is formed, at the base, by polymictic and immature conglomerate, which gradually passes into sandstone, shale, and limestone, with tuff and andesite spills interspersed. The characteristics of these lithologies possibly represent a transgression, from continental facies to marginal coastal and deep marine facies, with volcanism.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Chitinoidella]]></kwd>
<kwd lng="es"><![CDATA[Crassicollaria]]></kwd>
<kwd lng="es"><![CDATA[Remaniella]]></kwd>
<kwd lng="es"><![CDATA[Tintinnopsella carpathica]]></kwd>
<kwd lng="es"><![CDATA[transgresión]]></kwd>
<kwd lng="es"><![CDATA[Tithoniano-Berriasiano]]></kwd>
<kwd lng="es"><![CDATA[margen Pacífico]]></kwd>
<kwd lng="en"><![CDATA[Chitinoidella]]></kwd>
<kwd lng="en"><![CDATA[Crassicollaria]]></kwd>
<kwd lng="en"><![CDATA[Remaniella]]></kwd>
<kwd lng="en"><![CDATA[Tintinnopsella carpathica]]></kwd>
<kwd lng="en"><![CDATA[transgresión]]></kwd>
<kwd lng="en"><![CDATA[Tithonian-Berriasiano]]></kwd>
<kwd lng="en"><![CDATA[Pacific realm]]></kwd>
</kwd-group>
</article-meta>
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