Voltar
Artigo Acesso aberto Produção Nacional
BIBTEX RIS

Tafonomia da assembleia fossilífera de mamíferos da “Fenda 1968”, bacia de São José de Itaboraí, Estado do Rio de Janeiro, Brasil

2011; Volume: 14; Issue: 1 Linguagem: Inglês

10.4072/rbp.2011.1.08

ISSN

2236-1715

Autores

Lílian Paglarelli Bergqvist, Edmilson Igor Bernardo Almeida, Hermínio Araújo Júnior,

Tópico(s)

Paleontology and Evolutionary Biology

Resumo

Significant amount of taxonomic information has been extracted from fossil mammal assemblages of the São José de Itaboraí Basin, located at Rio de Janeiro State, Southeastern Brazil.However, taphonomic analysis, which are important for understanding the formation of these taphocoenosis, are rare and superficial.A limestone fissure excavated in 1968 (here called "1968 Fissure") stands out among the several known fossiliferous concentrations by its abundance of skeletal elements and by the unique brownish color of the specimens, which differentiate them from those collected in other fissures.This study aims to identify and interpret taphonomic features observed in the taphocoenosis "1968 Fissure", which include fractures, abrasion marks, desiccation marks, teeth marks, bone representativeness, and preservational patterns diagnostic for the occurrence and type of transport during the formation of fossiliferous concentration.Based on taphonomic analysis, the mammal taphocoenosis of the "1968 Fissure" is characterized as parautochthonous, being exposed for a short time before being deposited in the fissure after a short transport, possibly triggered by floods.Probably, predators did not influence the formation of the fossil assemblage studied.Only small mammals occur in the fissure due to a possible selection during the bioestratinomic phase.During the fossildiagenetic phase, several fractures were produced in the material due to compression generated by sediment deposition in the fissure.The observed pattern in the skeletal completeness shows the influence of anatomical features of mammals in differential preservation of skeletal remains during the process of fossilization.

Referência(s)