<?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>S1026-87742015000200323</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Isotope geochronology and vertebrate paleontology in Mexico: Panorama and critical appraisal]]></article-title>
<article-title xml:lang="es"><![CDATA[Geocronología isotópica y paleontología de vertebrados en México: panorama y evaluación crítica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferrusquía-Villafranca]]></surname>
<given-names><![CDATA[Ismael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-González]]></surname>
<given-names><![CDATA[José E.]]></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 ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2015</year>
</pub-date>
<volume>32</volume>
<numero>2</numero>
<fpage>323</fpage>
<lpage>342</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742015000200323&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742015000200323&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742015000200323&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The combined isotopic/paleontologic approach drove a qualitative leap in understanding Earth's geologic history/evolution, yet, in spite of its early start, it is still not widely used in México. Here we report 28 sites where such an approach was applied; their space/time distribution is uneven, leaving morphotectonic provinces and/or geochronologic intervals little or not studied at all. The sites are located in eight morphotectonic provinces, their age spans the Jurassic-Pliocene as follows: Baja California Península (BCP), one Cretaceous and one Miocene site. Northwestern Ranges, Basins and Plains (NW), one Miocene site. Sierra Madre Occidental (SMOc), four Miocene sites. Central Plateau (CeP), one Late Eocene and eight Miocene/Pliocene sites. Sierra Madre Oriental (SMOr), one Jurassic and one Miocene sites. Trans-Mexican Volcanic Belt (TMVB), two Miocene and three Pliocene sites. Sierra Madre del Sur (SMS), one Eocene and three Miocene sites. Sierra Madre de Chiapas (SMCh), one Miocene site. The Chihuahua-Coahuila sierras, basins and plateaus, Gulf Coastal Plain and Yucatan Platform lack such sites. The Pliensbachian Huizachal site (SMOr) lies in the rift system that split central-eastern Pangea and contains Mexico's oldest vertebrate fauna. The Late Campanian El Rosario site (BCP) is located in the namesake Forearc Basin, its fauna shows moderate endemism. The Cenozoic sites lie in graben structures and record episodes of tectonic and magmatic activity. The Eocene Marfil (CeP) and Yolomécatl (SMS) sites occur in post-Laramide basins, their Bridgerian and Duchesnian/ Chadronian faunas show boreal affinities and strong endemism. The Early Miocene Tubutama (NW) and Suchilquitongo (SMS) sites record tectonic/magmatic activity around 20 Ma, and their faunas display North American affinities and moderate endemism. The Middle Miocene La Purísima (BCP), Matatlán (SMS), El Camarón (SMS) and Ixtapa (SMCh) sites record tectonic and magmatic activity circa 15 Ma; the three latter ones disclose a volcanic belt extending from central Oaxaca to northern Chiapas; their faunas show North American affinities and evidence local cladogenesis. The Late Miocene Paso del Águila (SMOr), El Resbalón, Cofradía, Tepezalá, El Trapiche (SMOc), Rancho El Ocote (CeP) and Tecolotlán (TMVB) sites record tectonic/magmatic activity between 9.5 and 5.0 Ma; their mammals involve Late Clarendonian-Early Hemphillian and Hemphillian chronofaunas. The younger fauna reveals an early appearance of South American taxa in North America. The important Chapala site (TMVB) still lacks isotopic ages associated to Late Tertiary vertebrates. The pliocene GTO 43, Rancho El Ocote, GTO 2D, Garbani, GTO 11, Pantera, GTO 12B, Estancia, GTO 5A, Rancho El Ocote, GTO 55 sites (CeP), Santa María Amajac, Charo and Buenaventura sites (TMVB) record a 4.5-3.5 Ma tectonic/volcanic activity; their Blancan chronofauna includes numerous South American taxa, disclosing that the Great American Biotic Interchange reached its peak. These sites/ sequences also carry Late Hemphillian taxa, thus allowing studying mammalian succession and turnover in central Mexico. Finally, in the 27 reported sites with isotopic ages and studied Cretaceous-Tertiary vertebrates, the North American Land Mammal Age System is proven supporting the uncritical belief that it is appro- priate to date faunas from Mexico, in spite that this system is based on mammal faunas from temperate/cold North America.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El enfoque isotópico/paleontológico combinado impulsó un salto cualitativo en el entendimiento de la historia/evolución de la Tierra, empero, no se utiliza ampliamente en México a pesar de su temprano inicio. Reportamos aquí 28 sitios donde se empleó este enfoque; su distribución espacio/temporal es irregular, quedando provincias mor-fotectónicas y/o intervalos geocronológicos poco o nada estudiados. Los sitios yacen en ocho provincias morfotectónicas y abarcan del Jurásico al Plioceno: Península de Baja California (BCP), un sitio del Cretácico y uno del Mioceno. Sierras, cuencas y planicies del Noroeste (NW), uno del Mioceno. Sierra Madre Occidental (SMOc), cuatro del Mioceno. Altiplanicie Central (CeP), uno del Eoceno Tardío y ocho del Mioceno/Plioceno. Sierra Madre Oriental (SMOr), uno Jurásico y uno del Mioceno. Faja Volcánica Trans-Mexicana (TMVB), dos del Mioceno y tres del Plioceno. Sierra Madre del Sur (SMS), uno del Eoceno y tres del Mioceno. Sierra Madre de Chiapas (SMCh), uno del Mioceno. Las cuencas, sierras y mesetas de Chihuahua-Coahuila, Planicie Costera del Golfo, y Plataforma de Yucatán carecen de tales sitios. El sitio Pliensbachiano Huizachal (SMOr) yace en el rift que dividió Pangea centro-oriental y porta la vertebradofauna más antigua de México. El sitio Campaniano Tardío El Rosario está en la Cuenca de Antearco homónima, su fauna muestra endemismo moderado. Los sitios cenozoicos se encuentran en fosas tectónicas y registran episodios de actividad tectónica/magmática. Los sitios Marfil (CeP) y Yolomécatl (SMS) están en cuencas postlaramídicas, sus faunas Bridgeriana y Duchesniano/Chadronianas muestran afinidad boreal y endemismo. Los sitios temprano-micénicos Tubutama (NW) y Suchilquitongo (SMS) registran actividad tectónica/magmática alrededor de 20 Ma, sus faunas tienen afinidad boreal y endemismo moderado. Los sitios mesomiocénicos La Purísima (BCP), Matatlán, El Camarón (SMS) e Ixtapa (SMCh) registran actividad tectónica/magmática cercana a 15 Ma; los tres últimos evidencian una faja volcánica extendida desde Oaxaca central a Chiapas septentrional; sus faunas tienen afinidad boreal y cladogénesis local. Los sitios tardimiocénicos Paso del Águila (SMOr), El Resbalón, Cofradía, Tepezalá, El Trapiche (SMOc), Rancho El Ocote (CeP) y Tecolotlán (TMVB), registran actividad tectónica/magmática de hace unos 9.5-5.0 Ma; sus mamíferos involucran las cronofaunas Clarendoniano-Hemphilliana y Hemphilliana, esta última revela la aparición temprana de taxa sudamericanos en Norteamérica. El importante sitio Chapala aún carece de fechamientos isotópicos asociados a vertebrados tarditerciarios. Los sitios pliocénicos GTO 43, Rancho El Ocote, GTO 2D, Garbani, GTO 11, Pantera, GTO 12B, Estancia, GTO 5A, Rancho El Ocote, GTO 55 (CeP), Santa María Amajac, Charo y Buenaventura (TMVB) registran actividad tectónica/volcánica próxima a 4.5-3.5 Ma; su cronofauna Blancana incluye numerosos taxa sudamericanos, indicando así el apogeo del Gran Intercambio Biótico Americano. Estos(as) sitios/ sequencias portan también taxa hemphillianos, permitiendo entonces estudiar la sucesión y el reemplazamiento faunístico en México central. Finalmente, en los 27 sitios reportados con fechas isotópicas y en los vertebrados tardicretácico-terciarios estudiados, el Sistema North American Land Mammal Ages se corroboró, apoyando así la suposición de su idoneidad para fechar mastofaunas de México, a pesar de estar basado en faunas de Norteamérica templada/fría.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="en"><![CDATA[geochronology]]></kwd>
<kwd lng="en"><![CDATA[vertebrate paleontology]]></kwd>
<kwd lng="en"><![CDATA[Cenozoic]]></kwd>
<kwd lng="en"><![CDATA[Cretaceous]]></kwd>
<kwd lng="en"><![CDATA[Jurassic]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="es"><![CDATA[geocronología]]></kwd>
<kwd lng="es"><![CDATA[paleontología de vertebrados]]></kwd>
<kwd lng="es"><![CDATA[Cenozoico]]></kwd>
<kwd lng="es"><![CDATA[Cretácico]]></kwd>
<kwd lng="es"><![CDATA[Jurásico]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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