Abstract
The upper proterozoic metasedimentary rocks of the Acaua Formation, Estância Group, comprise an assemblage of sedimentary faeies indicative of deposition in transitional and shallow marine environments. The basal portion of the formation is composed of supratidal siliceous dolomites. These are overlain, in the intermediate portion by restricted shelf and shelf margin transgressive deposits with frequent mud intercalations indicating periodic dominance of fine terrigenous sedimentation. Typical supratidal black carbonate sediments dominate the upper part of the formation. On this basis, the Acaua Formation is interpreted as a record of a period of tectonic stability with instalation of a shelf sea along with concomitant widespread marine transgression in the Sergipean Fold Belt domain.
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