INVESTIGADORES
RABASSA jorge Oscar
libros
Título:
Southern Hemisphere Palaeobiogeography of Triassic-Jurassic Marine Bivalves
Autor/es:
DAMBORENEA, SUSANA; ECHAVARRÍA, JAVIER; ROS-FRANCH, SONIA
Editorial:
Springer Verlag
Referencias:
Lugar: Dordretch; Año: 2013 p. 139
ISSN:
978-94-007-5097-5
Resumen:
Bivalves have proven to have a great potential for paleobiogeographic analyses due to their relatively complete
fossil record, especially for Mesozoic and Cenozoic times. Being mostly benthonic, they have a large variety
of life habits which should be taken into account, particularly in detailed paleobiogeographic studies. We will
analyze marine bivalve distribution in the Southern Hemisphere during several successive time slices within
the Triassic and Jurassic, an epoch marked by critical geologic and biotic events. This period covers both the
biotic recovery after the harshest diversity crisis ever (the Permian/Triassic extinction event), and later also
the biotic reaction to another severe crisis at the Triassic/Jurassic boundary. This allows the opportunity to
evaluate the response of paleobiogeographic patterns to such events. The Earth?s configuration drastically
changed from a concentration of land masses in a unique supercontinent (Pangea) and two oceans (Tethys
and Panthalassa), to a fragmented series of continental land masses. These began to disperse, opening sea
corridors which largely affected not only the global distribution of biotas but also paleoclimate and sea
paleocurrents as well. This dynamic paleogeography adds an interesting ingredient to the study of past
distributions of benthic organisms making it possible to frame them into a physically and biologically
changing scenario.