Técnicas para o processamento de fósseis de bivalves: um estudo de caso sobre a formação Corumbataí, bacia do Paraná, Brasil.

Abstract

The Corumbatai Formation belongs to the Passa Dois Group in Parana Basin, Brazil, and dates from the end of the Paleozoic Era, more precisely from the (Upper) Permian Period. The Formation's fossil record is composed mainly of silicified bivalve mollusks embedded in sandstone, which are usually difficult to process and prepare. The present article describes some of the techniques commonly used in fossil processing, and tests their efficacy on fossil bivalves from the Corumbatai Formation. Mechanical and chemical treatments were performed, and the results show that the former are considerably more efficient than the latter. Keywords. Mollusks, Passa Dois Group, sandstone, silicified fossils, Upper Permian. Introducao