OCORRÊNCIA DE CONODONTES E FORAMINÍFEROS BENTÔNICOS NO BASHKIRIANO DA FORMAÇÃO PIAUÍ, GRUPO BALSAS, BACIA DO PARNAÍBA
Keywords:
Conodontes, Foraminíferos Bentônicos, Bacia do Parnaíba, Formação Piauí, BashkirianoAbstract
Conodonts are primitive marine vertebrates used worldwide for the refinement and age correlation of sedimentary sequences throughout the Paleozoic and Triassic. Foraminifera are abundant protists in sedimentary rocks that provide important information for the reconstruction of sedimentary environments (paleoecology) and for the relative dating of strata (biostratigraphy). Among the Brazilian intracratonic basins (located inside the continents) that present a record of the development of Paleozoic epicontinental seas in Western Gondwana, the Parnaíba Basin presents evidence of this marine invasion in the carbonate sequences of the Upper Member of the Piauí Formation, in particular in the fossiliferous sequence of Mocambo Carbonate. The study of the paleontological content in the carbonate rocks of this succession helps to reconstruct the paleoecological and paleoenvironmental scenario of the sequence, in addition to enabling biostratigraphic refinement, using fossil guides such as conodonts and foraminifera. This paper addresses the importance of these two groups of marine fossils as a geological tool in biostratigraphy and paleoecology and their occurrences in the Piauí Formation from the pioneer work in the 1979s to the current perspectives.