<?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>S1026-87742022000100071</article-id>
<article-id pub-id-type="doi">10.22201/cgeo.20072902e.2022.1.1672</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[A late Aptian planktic foraminiferal assemblage and pyrite framboids from the &#8220;Otates Horizon&#8221;, Cerro Boludo, Hidalgo, Mexico: Paleoecological and paleoenvironmental implications]]></article-title>
<article-title xml:lang="es"><![CDATA[Un conjunto de foraminíferos planctónicos del Aptiano tardío y framboides de pirita provenientes del &#8220;Otates Horizon&#8221;, Cerro Boludo, Hidalgo, México: implicaciones peleoecológicas y paleoambientales]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Omaña]]></surname>
<given-names><![CDATA[Lourdes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Caballero]]></surname>
<given-names><![CDATA[Iriliana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Núñez-Useche]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología Departamento de Paleontología]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología Departamento de Procesos Litosféricos]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>39</volume>
<numero>1</numero>
<fpage>71</fpage>
<lpage>81</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742022000100071&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742022000100071&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742022000100071&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Cretaceous carbonate deposits are widely distributed along the Sierra Madre Oriental thrust belt from northern Veracruz to southern Nuevo León. At Cerro Boludo (Hidalgo), dark marly limestone samples were collected from the &#8220;Otates Horizon&#8221;. The samples include a well-preserved planktic foraminiferal assemblage composed of Globigerinelloides algerianus Cushman and ten Dam, 1948, Globigerinelloides ferreolensis (Moullade, 1961), Globigerinelloides barri (Bolli, Loeblich and Tappan, 1957), Globigerinelloides aptiensis Longoria, 1974, Globigerinelloides blowi (Bolli, 1959), Hedbergella roblesae (Obregón de la Parra, 1959), H. occulta Longoria, 1974, H. luterbacheri Longoria, 1974, H. similis Longoria, H. trochoidea Longoria, 1974, H. semielongata Longoria, 1974, Pseudoplanomalina cheniourensis (Sigal, 1952) and Schackoina cenomana Schacko, 1897. Radiolarians are also present. Based on the planktic foraminiferal assemblage we recognized the Globigerinelloides algerianus Total Range Zone of early late to middle late Aptian age. The paleonvironmental reconstruction inferred from the lithology and the foraminiferal association suggests an open pelagic deposit, besides the occurrence of pyrite framboids and the organic matter indicate oxygen-depleted conditions in a meso to eutrophic setting probably linked to the &#8220;late Aptian anoxic event&#8221;.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Los depósitos carbonatados del Cretácico están ampliamente distribuidos a lo largo del cinturón de pliegues y cabalgaduras de la Sierra Madre Oriental desde el norte de Veracruz hasta el sur de Nuevo León. En la localidad de Cerro Boludo (Hidalgo) se colectaron muestras de margas calcáreas provenientes del &#8220;Otates Horizon&#8221; que incluye un conjunto de foraminíferos planctónicos bien conservados, compuesto por Globigerinelloides algerianus Cushman and ten Dam, 1948, Globigerinelloides ferreolensis (Moullade, 1961), Globigerinelloides barri (Bolli, Loeblich and Tappan, 1957) Globigerinelloides aptiensis Longoria, 1974, Globigerinelloides blowi (Bolli, 1959), Hedbergella roblesae (Obregón de la Parra, 1959), H. occulta Longoria, 1974, H. luterbacheri Longoria, 1974, H. trochoidea Longoria, 1974, H. similis Longoria, 1974, Pseudoplanomalina cheniourensis (Sigal, 1952) and Schackoina cenomana (Schacko, 1897). Los radiolarios también están presentes. Con base en el conjunto de foraminíferos planctónicos fue reconocida la Zona de Rango Total Globigerinelloides algerianus de la parte temprana a media del Aptiano tardío. La reconstrucción paleoambiental deducida de la litología y de la asociación de foraminíferos sugiere un depósito pelágico abierto; además la presencia de framboides de pirita y materia orgánica indican condiciones de disminución de oxígeno en condiciones meso a eutróficas vinculadas probablemente al &#8220;evento anóxico del Aptiano tardío&#8221;.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[foraminifera]]></kwd>
<kwd lng="en"><![CDATA[late Aptian]]></kwd>
<kwd lng="en"><![CDATA[&#8220;Otates Horizon&#8221;]]></kwd>
<kwd lng="en"><![CDATA[Cerro Boludo]]></kwd>
<kwd lng="en"><![CDATA[Hidalgo]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="es"><![CDATA[foraminíferos]]></kwd>
<kwd lng="es"><![CDATA[Aptiano tardío]]></kwd>
<kwd lng="es"><![CDATA[&#8220;Horizonte Otates&#8221;]]></kwd>
<kwd lng="es"><![CDATA[Cerro Boludo]]></kwd>
<kwd lng="es"><![CDATA[Hidalgo]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
</kwd-group>
</article-meta>
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