The calcareous sandstones and sandy limestones of the Bauru Group have been frequently mentioned in geologic literature of Brazil since the beginning of this century, but this Group has only recently been studied in detail and reliably divided into formations about two years ago. Only in 1973 was a detailed investigation carried out especially focusing on the petrologic, chemical and isotopic properties of these sediments, which for the first time were interpreted as calcretes. This paper reinterprets these petrologic studies and their geological significance in the light of recent literature on the calcretes in the world, and the recent revision of Bauru Group stratigraphy.
