Late Carboniferous postglacial brachiopod faunas in the Southwestern Gondwana margin

CISTERNA, G.A.; STERREN, A.F.

Palaeoworld

Elsevier BV

Lugar: Nanjing; Año: 2016 vol. 25 p. 569 - 580

1871-174X

The glaciomarine sediments related to the Late Paleozoic Ice Age (LPIA) have an excellent stratigraphic record in Argentina, particularly thoseassociated to the Late Carboniferous glacial episode identified along the southwestern margin of South America: Bolivia (Tarija Basin), westcentral Argentina (Calingasta-Uspallata Basin) and Patagonia (Tepuel-Genoa basins). The aim of this contribution is mainly a biostratigraphyupdate of the carboniferous brachiopod faunas that occur in the earliest postglacial interval (late Serpukhovian?Bashkirian) in the west centralArgentina (i.e., Levipustula and Aseptella-Tuberculatella/Rhipidomella-Micraphelia faunas) and its regional correlation with those equivalents inthe nearby basins. Components of these faunas are recognized from the Bolivia to Argentine Patagonia and their compositional variations appearto be controlled principally by a paleolatitudinal factor. The affinities showed by the postglacial faunas of the Calingasta-Uspallata Basin and thefaunal assemblages that integrate the Lanipustula and Tuberculatella biozones in Patagonia differ from the significant contrast proposed by otherauthors, based on the paleogeographical position of Patagonia in the Late Paleozoic. Paleoecological studies focused on the paleoenvironmentalcontrols related with the glacial dynamic are suggested to understand the complex relationship between these postglacial faunas.© 2016 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. All rights reserved.