Estudios Geológicos, Vol 75, No 2 (2019)

La transición ediacárico-cámbrica: facies sedimentarias versus extinción


https://doi.org/10.3989/egeol.43601.554

J. G. Gehling
Earth Sciences Section, South Australian Museum, Australia
orcid http://orcid.org/0000-0001-8459-5440

D. C. García-Bellido
Earth Sciences Section, South Australian Museum, Australia
orcid http://orcid.org/0000-0003-1922-9836

M. L. Droser
Department of Earth Sciences, University of California at Riverside, Estados Unidos
orcid http://orcid.org/0000-0001-7112-5669

M. L. Tarhan
Department of Geology and Geophysics, Yale University, Estados Unidos
orcid http://orcid.org/0000-0002-5878-929X

B. Runnegar
Department of Earth, Planetary and Space Sciences, University of California, Estados Unidos
orcid http://orcid.org/0000-0002-7412-7982

Resumen


Un estudio reciente de la Cuarcita de Rawnsley, en el Ediacárico terminal Ediacaran de la Cordillera de Flinders, Australia meridional, demuestra cómo algunos taxones clave de la biota de Ediacara están restringidos a ciertas facies sedimentarias y determinados niveles estratigráficos. La Cuarcita de Rawnsleycomprende tres miembros separados por discotinuidades: (i) el Miembro basal de la Arenisca de Chace es somera y azoica, aunque destacan las superficies con texturas orgánicas; (ii) el Miemrbo de la Arenisca de Ediacara rellena un Sistema de incisiones submarinas que recortan el miembro inferior de Chace y la Arenisca parálica de Bonney, infrayacente a la Cuarcita de Rawnsley; y (iii) el Miembro de la Arenisca de Ediacara es asimismo recortada de forma erosiva por el Miembro de la Arenisca de Nilpena, menos fosilífera.

Palabras clave


Control de facies; Cordillera de Flinders; Ediacárico; Australia

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Referencias


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