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A REVISION OF THE TRIASSIC AND JURASSIC TETRAPOD FOOTPRINTS OF ARGENTINA AND A NEW APPROACH ON THE AGE AND MEANING OF THE BOTUCATU FORMATION FOOTPRINTS (BRAZIL)

1990; Sociedade Brasileira de Geologia; Volume: 20; Issue: 1 Linguagem: Inglês

10.25249/0375-7536.1990216229

ISSN

2177-4382

Autores

Giuseppe Leonardi, FRANCISCO HENRIQUE DE OLIVEIRA,

Tópico(s)

Law, logistics, and international trade

Resumo

A description and a revision of the Triassic (Las Higueras Ischigualasto, Quebrada Los Rastros, Rio Los Tarros-Sur Pagancillo and Los Menucos) and Jurassic (Estância Laguna Manantiales) tetrapod ichnofaunas of Argentina and of the Botucatu Formation at Araraquara (São Paulo, Brazil) are given.The structures of these ichno-associations are compared.The Triassic Argentinean ichnofaunas present therapsids and archosaurians, specially quadrupedal thecodonts.Mammals are very rare.In the Jurassic (Oxfordian) ichnofauna of Estância Laguna Manantiales, mammals, accompanied by four dinosaurian forms, predominate.There are not obviously either therapsids nor quadrupedal thecodonts.The Botucatu Formation, whose age was up to now uncertain and is herein discussed, presents at Araraquara a rich ichnofauna.This includes many mammals, a few biopedal dinosaurs and some theromorphoid footprints, tentatively attributed to Tritylodontoidea.The Botucatu Formation, at least in the outcrops of the State of São Paulo and particularly in the Araraquara area, might be put into a period of time between the Rhaetian and Middle Jurassic, with a greater probability for Lower Jurassic or the lowest section of the Middle Jurassic.

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