Maastrichtian shallow-water ammonites of northeastern Mexico
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| Format: | Artículo científico |
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Universidad Nacional Autónoma de México
2005
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| author | Armin Schafhauser |
| author_facet | Armin Schafhauser |
| contents | Maastrichtian shallow-water ammonites of northeastern Mexico Armin Schafhauser Christina Ifrim Wolfgang Stinnesbeck Ciencias de la Tierra Mexico ammonites Maastrichtian paleobathymetry Upper Cretaceous In northeastern Mexico, extensive deltaic and prodeltaic sediment complexes developed duringMaastrichtian times, known as the Difunta Group and Escondido Formation in Coahuila and theNorthwest of Nuevo León, and the Cárdenas Formation in San Luis Potosí. These sediments containabundant and diverse invertebrate assemblages, among them the last ammonites in the area, prior totheir extinction. Sphenodiscus (S. lobatus, S. pleurisepta) and Coahuilites sheltoni are the dominantelements of this paucispecific fauna and clearly favored shallow water coastal environments. Ammonitesother than sphenodiscids are rare and restricted to occasional Baculites ovatus and a single Pachydiscus(Pachydiscus) neubergicus. This early (and possibly early late) Maastrichtian assemblage differs notablyfrom the coeval ammonite fauna of the distal prodeltaic and open marine Méndez Formation in easternNuevo León. The latter assemblage is far more diverse (23 species referred to 18 genera) and includes,in addition to typical Gulf of Mexico faunal elements, many Tethyan, cosmopolitan, and even southernhigh latitude Indopacific species previously unknown from Mexico. Faunal differences between the twonearby outcrop areas are thus clearly related to paleobathymetry and not to paleobiogeography, beingBaculites ovatus the only conspecific element. 2005 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57222106 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.1 Vol.22 |
| format | Artículo científico |
| id | redalyc_57222106 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Maastrichtian shallow-water ammonites of northeastern Mexico Armin Schafhauser Ciencias de la Tierra Mexico ammonites Maastrichtian paleobathymetry Upper Cretaceous Maastrichtian shallow-water ammonites of northeastern Mexico Armin Schafhauser Christina Ifrim Wolfgang Stinnesbeck Ciencias de la Tierra Mexico ammonites Maastrichtian paleobathymetry Upper Cretaceous In northeastern Mexico, extensive deltaic and prodeltaic sediment complexes developed duringMaastrichtian times, known as the Difunta Group and Escondido Formation in Coahuila and theNorthwest of Nuevo León, and the Cárdenas Formation in San Luis Potosí. These sediments containabundant and diverse invertebrate assemblages, among them the last ammonites in the area, prior totheir extinction. Sphenodiscus (S. lobatus, S. pleurisepta) and Coahuilites sheltoni are the dominantelements of this paucispecific fauna and clearly favored shallow water coastal environments. Ammonitesother than sphenodiscids are rare and restricted to occasional Baculites ovatus and a single Pachydiscus(Pachydiscus) neubergicus. This early (and possibly early late) Maastrichtian assemblage differs notablyfrom the coeval ammonite fauna of the distal prodeltaic and open marine Méndez Formation in easternNuevo León. The latter assemblage is far more diverse (23 species referred to 18 genera) and includes,in addition to typical Gulf of Mexico faunal elements, many Tethyan, cosmopolitan, and even southernhigh latitude Indopacific species previously unknown from Mexico. Faunal differences between the twonearby outcrop areas are thus clearly related to paleobathymetry and not to paleobiogeography, beingBaculites ovatus the only conspecific element. 2005 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57222106 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.1 Vol.22 |
| title | Maastrichtian shallow-water ammonites of northeastern Mexico |
| topic | Ciencias de la Tierra Mexico ammonites Maastrichtian paleobathymetry Upper Cretaceous |
| url | https://www.redalyc.org/articulo.oa?id=57222106 |