The tectonic setting of the Caribbean region and the K/T turnover of the South American land-mammal fauna

E. Ortiz-Jaureguizar; R. Pascual

doi:10.21701/bolgeomin.122.3.004

Autores/as

E. Ortiz-Jaureguizar LASBE (Laboratorio de Sistemática y Biología Evolutiva), Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
R. Pascual División Paleontología Vertebrados, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata

DOI:

https://doi.org/10.21701/bolgeomin.122.3.004

Palabras clave:

Cretácico, extinción, inmigración, Paleoceno, paleogeografía

Resumen

De acuerdo con el registro fósil, durante el Cretácico Tardío-Paleoceno Temprano ocurrió un intercambio de vertebrados continentales (e.g., serpientes bóidas, dinosaurios, mamíferos) entre las Américas. El arribo de los inmigrantes norteamericanos (particularmente marsupiales y placentarios) durante el Cretácico más tardío y el Paleoceno más temprano tuvo una influencia crucial en la composición de las comunidades de mamíferos de América del Sur. Durante el Cretácico tardío estas comunidades estuvieron dominadas por grupos nativos de abolengo pangeico, los cuales representaban más del 95% de los géneros conocidos. Sin embargo, durante el Paleoceno Temprano el 70% de los mamíferos derivaba de aquellos inmigrantes norteamericanos arribados durante el Cretácico Tardío-Paleoceno más temprano, y durante el Paleoceno Tardío, todos los mamíferos sudamericanos (con la posible excepción de los xenartros) derivaban de aquellos inmigrantes. A pesar de que ninguna evidencia geológica soporta la existencia de una comunicación continua entre las Américas durante el intervalo Cretácico Tardío-Paleoceno Temprano, el registro fósil elocuentemente sostiene la existencia de una conexión terrestre transitoria entre ambas Américas hacia finales del Cretácico. Esta interpretación es soportada por las recientes reconstrucciones geográficas de la región caribeña.

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