Geology and taphonomy of the base of the Taquaral Member, Irati Formation (Permian, Paraná Basin), Brazil

• Autorzy: Chahud A. , Petri S.

Identyfikatory

DOI

10.1515/agp-2015-0018

• Języki publikacji: EN

Abstrakty

EN

The taphonomy of Early Permian vertebrates from a sandy facies at the base of the Taquaral Member, Irati Formation, was surveyed in order to acquire data for the interpretation of the sedimentary processes and paleoenvironment of deposition. Six outcrops from the Rio Claro municipality and surrounding areas, from the Brazilian State of São Paulo, were investigated. The vertebrate groups are Chondrichthyes (Xenacanthiformes, Ctenacanthiformes and Petalodontiformes), Osteichthyes (Actinopterygii and Sarcopterygii) and Tetrapodomorpha. They occur as loose teeth, scales, spines and bone remains. The sandy facies is characterized by fining upward deposition. The coarser sandstone immediately above the underlying Tatuí Formation is rich in Chondrichthyes. However, the fine sandstone above, immediately beneath the silty shale facies, is devoid of Chondrichthyes, though Osteichthyes scales, teeth and bones were present. The taphonomy is important for inferring sedimentary processes and then the paleoenvironments. The poor sorting of the sandstone and the presence of fossils that are mostly abraded or worn are indicative of a high energy environment. In contrast, the presence of fossils in a good state of preservation, some without abrasion and breakages are indicative of only limited transport. Differences of fossil spatial density, numbers of specimens and taxa may be explained by the dynamics of deposition, from details of the palaeoenvironment can be obtained.

Słowa kluczowe

EN

taphonomy; permian; actinopterygii; sarcopterygii; Chondrichthyes

PL

tafonomia; perm; promieniopłetwe; mięśniopłetwe; ryby chrzęstnoszkieletowe

• Wydawca: Faculty of Geology of the University of Warsaw ; Komitet Nauk Geologicznych PAN
• Czasopismo: Acta Geologica Polonica
• Rocznik: 2015
• Tom: Vol. 65, no. 3
• Strony: 379--387
• Opis fizyczny: Bibliogr. 30 poz., fot., rys., tab.

Twórcy

autor

Chahud A.

• Universidade de São Paulo, Instituto de Geociências, Departamento de Geologia Sedimentar e Ambiental. Rua do Lago, 562. Cidade Universitária 05508-080 - São Paulo, SP – Brazil

autor

Petri S.

• Universidade de São Paulo, Instituto de Geociências, Departamento de Geologia Sedimentar e Ambiental. Rua do Lago, 562. Cidade Universitária 05508-080 - São Paulo, SP – Brazil

Bibliografia

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