Artículos de revistas
The Permian Tiaraju bivalve assemblage, Passa Dois Group, southern Brazil: biostratigraphic and paleobiogeographic significance
Fecha
2017-06-01Registro en:
Brazilian Journal Of Geology. Sao Paulo: Soc Brasileira Geologia, v. 47, n. 2, p. 209-224, 2017.
2317-4889
10.1590/2317-4889201720170013
S2317-48892017000200209
WOS:000408730200003
S2317-48892017000200209.pdf
1333845337012256
Autor
Universidade Estadual Paulista (Unesp)
Universidade de São Paulo (USP)
Companhia Pesquisas Recursos Minerais
Institución
Resumen
Permian bivalves of the Parana Basin evolved in a large inland sea, under conditions of extreme isolation and environmental stress. Although known since 1918, its evolutionary history is still obscure due to the incomplete and biased information on faunal composition and stratigraphic distribution of various assemblages. Hence, the description of the Tiaraju assemblage, the only known bivalve occurrence in the Passa Dois Group from the southernmost Brazil, adds new key information on the composition, biocorrelation and age of this unique molluscan fauna. Terraia falconeri, Cowperesia emerita, Holdhausiella elongata, and Terraia altissima were recorded and described. T. falconeri is the commonest species, followed by C. emerita, H. elongata and T. altissima. The faunule is mainly composed by Terrainae, lacking Pinzonellinae. Assemblage is, thus, poorly diversified, both regarding the faunal composition and guild structure (only infaunal, facultatively motile, unattached, suspension feeders present). Cowperesia emerita and T. altissima strongly indicate biocorrelation with assemblages of the Rio do Rasto and Gai-As formations, Brazil and Namibia, providing an age no younger than the mid-Permian (Wordian-Captianian). On the light of this information, the current geological map of the Tiaraju region, Sao Gabriel, and the local boundary between the Teresina and Rio do Rasto formations requires reevaluation.