Taphonomy of the south-Brazilian Triassic vertebrates

Holz, M.; Souto Ribeiro, A.

Revista Brasileira de Geocienciassetembro; 30(3): 491-494

2000


Accession: 021852314

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Abstract
The south-Brazilian Triassic rocks have a rich fossil record. In the Scythtian Sanga do Cabral Formation this record consists mainly of fragmentary amphibians and reptilian bone elements, while articulated material is never found. This peculiar taphonomic mode of occurrence is linked to the depositional system of the Sanga do Cabral Formation, a unit generated under ephemeral, Bijou Creek-like fluvial conditions. In the Ladinian-Carnian Santa Maria Formation dicynodonts, rhynchosaurs, tecodonts, cynodonts and dinosaurs occur under different taphonomic modes, from articulated skeletons to fragmentary remains. The four taphonomic classes of the Santa Maria Formation were generated in an anastomosing fluvial system. Permineralization with calcite results in many disrupted and distorted fossils in the Santa Maria Formation, while the Sanga do Cabral taphocoenosis is well preserved.