Biostratigraphy of Lower Cretaceous microfossils from the Araripe basin, northeastern Brazil |
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| Authors: | João Carlos Coimbra Mitsuru AraiAna Luisa Carreño |
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| Institution: | a Departamento de paleontología e estratigrafia, instituto de geociências, universidade federal do Rio Grande do Sul, Cx.P. 15001, CEP. 91501-970, Porto Alegre, RS, Brazilb Petróleo Brasileiro S. A./CENPES/PDEP/BPA, Ilha do Fundão-Quadra 7, CEP. 21949-900, Rio de Janeiro, RJ, Brazilc Instituto de geología, circuito exterior, C.U., delegación de Coyoacán, 04510 D. F. , Mexico |
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| Abstract: | A biostratigraphic study was carried out in the Lower Cretaceous Araripe basin, northeastern Brazil, allowing the recognition of several chronostratigraphic units: the Dom João (Jurassic?-Lower Cretaceous?), the Rio da Serra (Neocomian) and the Alagoas (Aptian/Albian) local stages. For the first time a large hiatus between the Rio da Serra and Alagoas local stages is carefully documented. The palynomorphs and the ostracode associations throughout the Jurassic?-Aptian/Albian sequence allow the interpretation of the paleoenvironmental evolution of the Araripe basin which otherwise confirms that a polycyclical sedimentation occurred in the basin, being one of the controlling factors on the distribution of ostracodes and palynomorphes. |
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| Keywords: | Ostracoda Palynomorphs Lower Cretaceous Araripe basin Biostratigraphy Northeastern Brazil |
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