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The AAPG/Datapages Combined Publications Database
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Changes in the oceanographic and sedimentologic regime off southern Brazil are reflected in the carbonate enrichment and foraminiferal assemblages of the shelf sediments. North of Cabo Frio, carbonate-rich sands and gravels are characterized by Halimeda, bryozoans, and coralline algae; tropical Foraminifera include various species of miliolids and peneroplids, as well as the encrusting Homotrema rubrum. Subtropical deposits of carbonate-rich sediments between Cabo Frio and Sao Paulo are primarily restricted to the outer shelf, and are dominated by coralline algae and increased amounts of agglutinated Foraminifera. Temperate-water carbonate deposits off southernmost Brazil contain mainly barnacles and mollusks, and fewer agglutinated Foraminifera.
Carbonate sediments generally are not important in the middle-shelf muds and inner-shelf sands. Benthonic Foraminifera in nearshore waters (particularly in temperate areas) are characterized by paucity of both species and individuals.
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