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Facies of the Rio do Rasto Formation, Sao Leopoldo folio, Rio Grande do Sul, Brazil



Facies of the Rio do Rasto Formation, Sao Leopoldo folio, Rio Grande do Sul, Brazil



Estudos Tecnologicos 23(50): 11-38



Among the sedimentary units from Parana Basin that appear in the Sao Leopoldo Sheet, Rio Grande do Sul State, Brazil, there is the Rio do Rasto Formation. This Permian-Triassic formation, is constituted by the members Serrinha (lower) and Morro Pelado (upper). The Rio do Rasto Formation presents a lower conformable contact with the Teresina Formation, and an upper unconformable contact with the Sanga do Cabral Formation. The environment associated with a large sedimentary facies present in the Serrinha Member allow it to be considered the result of deposition in a medium to upper plataform water body, maybe lacustrine. The sedimentary facies association of the Morro Pelado Member puts it in a continental context with lakes and meandering rivers. The presence of hygrophytic vegetation (Sphenophita) remains points to the existence of a climate with regular rain precipitation alternating with extreme arid periods, when winds dominated and dunes and interdunes were built up.

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