<?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>S1405-33222022000100105</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2022v74n1a250821</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Disconformity between the El Abra Formation underlying the &#8220;Temazcal unit&#8221; in Cerro Quemado locality, Temazcal, San Luis Potosí, Mexico: Biostratigraphy and microfacies analysis]]></article-title>
<article-title xml:lang="es"><![CDATA[Disconformidad entre la Formación El Abra, subyaciendo la &#8220;unidad Temazcal&#8221; en la localidad Cerro Quemado, Temazcal, San Luis Potosí, México: bioestratigrafía y análisis de microfacies]]></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 Doncel]]></surname>
<given-names><![CDATA[Rubén Alfonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres Hernández]]></surname>
<given-names><![CDATA[José Ramón]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barboza Gudiño]]></surname>
<given-names><![CDATA[José Rafael]]></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[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Instituto de Geología ]]></institution>
<addr-line><![CDATA[San Luis Potosí ]]></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>74</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222022000100105&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222022000100105&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222022000100105&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT On the western part of the Valles-San Luis Potosí Platform located in Cerro Quemado near Temazcal, municipality of Armadillo de Los Infante, two sequences crop out. The lower one is the shallow-water El Abra Formation of the mid-upper Cenomanian, unconformably covered by a deep-water deposit of the upper Maastrichtian informally called here the &#8220;Temazcal unit.&#8221; The succession presents a nonconforming contact between these two sedimentary units, displaying a hiatus as the result of a time of non-deposition in the sedimentary record, showing a subaerial exposure with erosion yielding topographic relief. Based on the lithological changes from the underlying limestone toward the overlying silty limestone, as well as a detailed biostratigraphic study based on foraminiferal associations that provide an accurate dating, it has been possible to estimate the magnitude of the hiatus, which spans from the lower part of the Turonian, including the Coniacian, the Santonian, and possibly the lower part of the Maastrichtian.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En la parte occidental de la Plataforma Valles-San Luis Potosí en la localidad cerro Quemado cercano a El Temazcal, municipalidad de Armadillo de Los Infante, afloran dos secuencias: una inferior de aguas someras de la Formación El Abra del Cenomaniano medio-superior y, sobreyaciendo en discordancia, un depósito de aguas profundas del Maastrichtiano superior llamado informalmente &#8220;unidad Temazcal&#8221;. El contacto discordante entre estas dos unidades sedimentarias mostró un hiatus como resultado de un tiempo de no depósito en el registro sedimentario, combinado con la erosión y que produjo un relieve topográfico. Sobre la base de los cambios litológicos desde la caliza subyacente hacia la caliza limosa, así como del estudio bioestratigráfico detallado basado en las asociaciones foraminiferales, se ha establecido una datación precisa, haciendo posible estimar la magnitud del hiatus, que se extiende desde la parte inferior del Turoniano, incluyendo el Coniaciano, el Santoniano y posiblemente la parte inferior del Maastrichtiano.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Disconformity]]></kwd>
<kwd lng="en"><![CDATA[El Abra Formation]]></kwd>
<kwd lng="en"><![CDATA[&#8220;Temazcal unit&#8221;]]></kwd>
<kwd lng="en"><![CDATA[San Luis Potosí]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="es"><![CDATA[Disconformidad]]></kwd>
<kwd lng="es"><![CDATA[Formación El Abra]]></kwd>
<kwd lng="es"><![CDATA[&#8220;unidad El Temazcal&#8221;]]></kwd>
<kwd lng="es"><![CDATA[San Luis Potosí]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
</kwd-group>
</article-meta>
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