Portal de Periódicos da CAPES

Paleontology and depositional environments of the Tatuí and Irati formations (Permian) in the Ponte Nova Farm, Ipeúna, state of São Paulo

2012; Sociedade Brasileira de Geologia; Volume: 42; Issue: 1 Linguagem: Inglês

10.5327/rbg.v42i1.1612

2317-4889

Artur Chahud, Mírian Liza Alves Forancelli Pacheco, Felipe van Enck Meira, Guilherme Raffaeli Romero, Setembrino Petri,

Ichthyology and Marine Biology

The Parana Basin, located at the center-eastern South America, exhibits a thick succession of Late Paleozoic deposits. Two early Permian formations are present in the State of Sao Paulo, Brazil: Tatui (the oldest) and Irati. Two members make up the Irati Formation - the Taquaral (the oldest) and Assistencia. This paper discusses the facies of the upper Tatui Formation and Taquaral Member, and their fossil content, mainly at the Ponte Nova Farm. This locality exhibits well-preserved outcrops of both units, with informative data on the facies relationships and their fossils. Crustaceans and vertebrates are presented at both the Tatui and Taquaral beds. Different facies were recognized at Ponte Nova Farm, based on lithosomes, fossils and their relationships. In this context, a complex six facies architecture displayed at this locality allowed the formulation of a paleoenvironment hypothesis for the generation of the Tatui Formation. The fi ne cross-bedded sandstone with subordinate planeparallel strata (facies 1) might have been laid down by a rather topographic mild coastal environment. Facies 2 is the result of low energy slack water subenvironment passing to facies 3, a high energy water system. The facies 4 is the result of an encroaching coastal environment over the continent. Taquaral facies 5 might be the result of a very high energy, body of water, becoming very quieter later, when facies 6 was deposited.