Abstract
In the Central Camaquã Sub-basin, the Santa Bárbara Group (Ediacaran) is over 2,000 m thick, being well exposed in the Minas do Camaquã and Bom Jardim regions. The group is represented by a succession of marine to coastal sandstones and rhythmites and alluvial fan conglomerates, disposed in progradationalretrogrational cycles. Detailed stratigraphic studies of paleoenvironments, paleocurrents and provenance have lead to the subdivision of the Santa Bárbara Group, in the Central Camaquã Sub-basin, into four formations: (i) Passo da Capela Formation: silty-sandy unit composed of outer- and inner-submarine fan turbidites; (ii) Seival Formation: offshore tempestites and coastal deposits, including tidal flat deposits; (iii) Rincão dos Mouras Formation: alluvial fan and braided river pebbly unit and (iv) João Dias Formation: foreshore and shoreface coastal deposits. These studies have permitted the detailed correlation between the Minas do Camaquã and Bom Jardim regions, thus supporting the proposition of including, in the here defined Santa Bárbara Group, the deposits exposed in the Minas do Camaquã region, traditionally reported to the Arroio dos Nobres Formation.
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