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La dispersión de mamíferos en el límite entre el Paleoceno y el Eoceno
Gabriel J Bowen1, William C Clyde, Paul L Koch
1Department of Earth Sciences, University of California, Santa Cruz, CA 95064, USA. gbowen@es.ucsc.edu
Science (New York, N.Y.)
|March 16, 2002
Resumen
Los grupos de mamíferos aparecieron rápidamente en los continentes cerca de la frontera entre el Paleoceno y el Eoceno. La investigación sugiere que Asia fue un centro clave para la evolución temprana de los mamíferos y su dispersión a América del Norte y Europa.
Área de la Ciencia:
- Paleontología Paleontología.
- La estratigrafía es la estratigrafía.
- Evolución de los mamíferos Evolución de los mamíferos
Sus antecedentes:
- Una importante reorganización de la fauna ocurrió en el límite Paleoceno/Eoceno.
- Varios grupos de mamíferos aparecieron abruptamente en los continentes Holarctic durante este período.
Objetivo del estudio:
- Para probar la hipótesis de la dispersión de los mamíferos de Asia a América del Norte y Europa.
- Para determinar el origen y el momento de aparición de los primeros grupos de mamíferos.
Principales métodos:
- La estratigrafía de isótopos es una estratigrafía de isótopos.
- La magnetostratigrafía es una estratigrafía magnética.
- La biocronología cuantitativa es una biocronología cuantitativa.
- Las fechas de las faunas asiáticas.
Principales resultados:
- La extinta familia Hyaenodontidae apareció en Asia antes de llegar a América del Norte.
- Las órdenes modernas de mamíferos (Primates, Artiodactyla, Perissodactyla) aparecieron por primera vez en Asia en o antes de la frontera Paleoceno/Eoceno.
Conclusiones:
- Los hallazgos apoyan la hipótesis de dispersión desde Asia.
- Asia se indica como un centro para el origen de los primeros mamíferos y la posterior dispersión Holarctic.
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