<?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>S1405-33222025000200001</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2025v77n2a190625</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Reworked K/Pg ejecta in early Paleocene deposits, Difunta Group, NE Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Ejecta del K/Pg retrabajados en depósitos del Paleoceno temprano, Grupo Difunta, NE de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cadena-González]]></surname>
<given-names><![CDATA[David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barragán]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vega-Sandoval]]></surname>
<given-names><![CDATA[Francisco A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Aguilar]]></surname>
<given-names><![CDATA[Criseida]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vega]]></surname>
<given-names><![CDATA[Francisco J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Posgrado en Ciencias Biológicas Unidad de Posgrado]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Escuela Nacional de Estudios Superiores Unidad Juriquilla]]></institution>
<addr-line><![CDATA[Juriquilla Querétaro]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>77</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222025000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222025000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222025000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Chicxulub impact triggered massive sediment removal and deposit of ejecta around the world. The impact must also have triggered large tsunamis, whose geological record is nevertheless scarce. Some of the tsunamite backwash deposits were reworked during early Paleocene, and evidence of severe earthquakes and ejecta fall are preserved along the tsunamite deposits at top of Cretaceous and the base of lower Paleocene sediments in the Difunta Group, within Parras and La Popa basins, NE Mexico. Tsunamite backwash deposits were previously studied near El Papalote diapir (La Popa Basin, Nuevo León), where pseudotektites and bioclasts are ubiquitously abundant, along with diverse bioclasts and intraclasts of different lithologies that include igneous, metamorphic and sedimentary rocks from outcrops located to the N of the Difunta Group. We report here on three localities with lower Paleocene tempestites at La Popa Basin, all interpreted as storm deposits. These outcrops are found at the top of the K/Pg Delgado Sandstone Member and also include altered pseudotektites and bioclasts. Although ejecta and bioclasts were already reported from two localities (El Papalote and Amargos), we also illustrate deformed quartz and uncommon bioclasts such as crab cuticle, ammonite nuclei and shark teeth.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El impacto de Chicxulub disparó una remoción masiva de sedimentos y depósitos en todo el mundo. Seguramente, el impacto debió generar grandes terremotos y tsunamis cuyo registro geológico es escaso. Algunos de estos depósitos fueron retrabajados durante el Paleoceno temprano, posiblemente debido a intensas tormentas, consecuencia de alteraciones en la atmósfera, con evidencias de terremotos intensos y caída de eyecta preservadas a lo largo de depósitos de tsunamita que se encuentran entre la cima del Cretácico y la base del Paleoceno inferior en el Grupo Difunta, en las cuencas de Parras y La Popa, NE de México. Depósitos que representan el regreso de la tsunamita hacia la cuenca del golfo de México han sido estudiados cerca del diapiro El Papalote (Cuenca La Popa, Nuevo León), en donde pseudotectitas, bioclastos son localmente abundantes, junto con diversos bioclastos e intraclastos de diversas litologías que incluyen rocas ígneas, metamórficas y sedimentarias, acarreadas de afloramientos ubicados al N de la Cuenca La Popa. Previamente, dos localidades con eyecta han sido reportadas para las cuencas de Parras y La Popa. Aquí reportamos otras tres localidades con tempestitas del Paleoceno inferior, ubicadas en la Cuenca de La Popa. Estos afloramientos se encuentran en la porción superior de Miembro de Arenisca Delgado, cuya edad se estima alrededor del límite, incluyendo pseudotectitas. Eyecta y bioclastos han sido reportados previamente para dos afloramientos (El Papalote y Amargos). Adicionalmente, aquí reportamos cuarzo deformado y bioclastos como cutícula de cangrejo, núcleos de ammonite y dientes de tiburón.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[K/Pg]]></kwd>
<kwd lng="en"><![CDATA[tsunamite]]></kwd>
<kwd lng="en"><![CDATA[tempestites]]></kwd>
<kwd lng="en"><![CDATA[ejecta]]></kwd>
<kwd lng="en"><![CDATA[bioclasts]]></kwd>
<kwd lng="en"><![CDATA[Difunta Group]]></kwd>
<kwd lng="es"><![CDATA[K/Pg]]></kwd>
<kwd lng="es"><![CDATA[tsunamita]]></kwd>
<kwd lng="es"><![CDATA[tempestitas]]></kwd>
<kwd lng="es"><![CDATA[eyecta]]></kwd>
<kwd lng="es"><![CDATA[bioclastos]]></kwd>
<kwd lng="es"><![CDATA[Grupo Difunta]]></kwd>
</kwd-group>
</article-meta>
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