<?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>S1405-33222023000200103</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2023v75n2a120423</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Nuevos registros de osículos columnares de crinoideos del Pérmico (Cisuraliano temprano) de Chiapas, México]]></article-title>
<article-title xml:lang="en"><![CDATA[New records of columnar ossicles of crinoids from the Permian (early Cisuralian) of Chiapas, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Huitrón-Vargas]]></surname>
<given-names><![CDATA[Gilberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Martínez]]></surname>
<given-names><![CDATA[Miguel A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Iztacala ]]></institution>
<addr-line><![CDATA[Tlalnepantla de Baz Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología Departamento de Paleontología]]></institution>
<addr-line><![CDATA[Coyoacán CDMX]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<volume>75</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222023000200103&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222023000200103&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222023000200103&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se describe una nueva asociación, compuesta por 10 morfoespecies de osículos columnares de crinoideos pertenecientes a ocho morfogéneros diferentes. La biota está compuesta por Cylindrocauliscus fiski, Cyclocaudex cf. plenus, Cyclocaudex costatus, Preptopremnum cf. rugosum, Preptopremnum laeve, Heterostelechus jeffordsi, Cycloscapus laevis, Cyclocaudiculus regularis, Nothrosterigma merum y Cyclogrupera minor. Los ejemplares se encontraron en rocas de la Formación Grupera del Asseliano-Sakmariano (Pérmico inferior), perteneciente a la sucesión del Carbonífero-Pérmico que aflora en la región de Chicomuselo, al sureste del territorio mexicano. Del material descrito, se detectó la primera ocurrencia de C. costatus, P. rugosum, C. laevis y N. merum para Chiapas. Asimismo, destaca el primer registro de N. merum para México, el cual junto con P. rugosum son reportados por primera vez para el Cisuraliano de Norteamérica. Pese a la controversia sobre la utilidad de los osículos de crinoideos como fósiles índice, por sus amplios alcances estratigráficos, fue posible denotar que los taxones descritos, en conjunto, señalaban una edad aproximada del Asseliano-Sakmariano (Cisuraliano temprano), sugerida previamente para la formación. El hallazgo de los osículos, asociados a otros invertebrados marinos filtradores como briozoos y braquiópodos, aunado al tipo de conservación y las características litológicas de las rocas portadoras permitieron establecer que el paleoambiente de depósito se relacionaba con facies de aguas someras de alta energía, bien iluminadas y con un aporte constante de terrígenos. Respecto a la paleobiogeografía, se observa que la distribución de los crinoideos estuvo relacionada con la historia geológica de la región, la cual estuvo influenciada por los cambios oceánicos y continentales ocurridos a raíz de la formación del supercontinente Pangea a finales del Pensilvánico. Esto favoreció el surgimiento de provincialismos genéricos y específicos en Norteamérica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We described a new association of 10 morphospecies of crinoid columnar ossicles from eight different morphogenera. The biota includes Cylindrocauliscus fiski, Cyclocaudex cf. plenus, Cyclocaudex costatus, Preptopremnum cf. rugosum, Preptopremnum leave, Heterostelechus jeffordsi, Cycloscapus laevis, Cyclocaudiculus regularis, Nothrosterigma merum, and Cyclogrupera minor. The specimens were located in rocks from the Grupera Formation of Asselian-Sakmarian age (lower Permian). The lithostratigraphic unit belongs to the Carboniferous-Permian succession that outcrops in the Chicomuselo region in southeastern Mexico. It is recorded the first occurrence of C. costatus, P. rugosum, C. laevis, and N. merum for the Cisuralian of North America. Likewise, it highlights the first record of N. merum in Mexico, which along with P. rugosum are reported for the first time in the Cisuralian of North America. Despite controversy over the usefulness of crinoid ossicles as index fossils, it was possible relating the rocks of the locality studied to an approximate Asselian-Sakmarian age (early Cisuralian), previously suggested for the formation. Furthermore, the find of ossicles associated with other filtering marine invertebrates such as bryozoans and brachiopods, as well as preservation and lithological features of the rocks, allowed establishing that the depositional paleoenvironment was related to shallow water facies of high energy, well-illuminated, and with an important terrigenous supply. Regarding paleobiogeography, the distribution of crinoids was associated with the region&#8217;s geologic history, which was influenced by oceanic and continental changes that occurred during the formation of the Pangea supercontinent in the Late Pennsylvanian. This favored the emergence of generic and specific provincialisms in North America.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[osículos de crinoideos]]></kwd>
<kwd lng="es"><![CDATA[Asseliano - Sakmariano]]></kwd>
<kwd lng="es"><![CDATA[Formación Grupera]]></kwd>
<kwd lng="es"><![CDATA[paleoambiente]]></kwd>
<kwd lng="es"><![CDATA[paleobiogeografía]]></kwd>
<kwd lng="en"><![CDATA[Crinoid ossicles]]></kwd>
<kwd lng="en"><![CDATA[Asselian - Sakmarian]]></kwd>
<kwd lng="en"><![CDATA[Grupera Formation]]></kwd>
<kwd lng="en"><![CDATA[paleoenvironment]]></kwd>
<kwd lng="en"><![CDATA[paleobiogeography]]></kwd>
</kwd-group>
</article-meta>
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