Paleoclimatic evidence from the Bauru Group, Cretaceous of the Paraná Basin, Brazil

Abstract

Numerous papers have been published on the Bauru Group, which represents the most important Cretaceous continental deposits in Brazil. Nevertheless, paleoclimatic evidence was rarely discussed. This work deals with the calcrete deposits, atapulgite clay mineral, rudaceous deposits, immaturity of sediments and geochemical properties as evidence of warm and dry (semi-arid) paleoclimate during the greatest part of the Bauru Group sedimentation. On the other hand, its fossiliferous content must be considered as an argument in support of intervals of warm and humid paleoclimate.