Aptian microfossils from the southwest portion of the Araripe Basin, Pernambuco State, Northeastern Brazil
DOI:
https://doi.org/10.4072/rbp.2024.3.0443Abstract
Known worldwide for the excellent preservation of its fossils, the Araripe Basin, located between the states of Ceará, Piauí, and Pernambuco, has been the target of hundreds of studies on micropaleontology over the last few decades. However, papers focusing on this basin within the Pernambuco State are scarce. In the present work, microfossils (especially ostracods) recovered from samples of the well AR-TR-3-PE drilled in the city of Trindade were studied. The recovered ostracod assemblage is typically Aptian, as follows: Neuquenocypris cf. N. berthoui Colin & Dépêche, Pattersoncypris micropapillosa Bate, Pattersoncypris sp., Damonella grandiensis Tomé et al., and Theriosynoecum silvai (Silva). These ostracods were associated with other fossil groups, such as benthic foraminifera (Bathysiphon? sp., Rhizammina sp., and Psammosphaera? sp.), seeds, gastropods, bivalves, and fish teeth. Overall, this mixohaline association suggests a transitional paleoenvironment to the Aptian interval in the southwest portion of the Araripe Basin.
Keywords: Early Cretaceous, ostracods, foraminifera, paleoecology.
Resumo – Conhecida mundialmente pela excelente preservação de seus fósseis, a Bacia do Araripe, que está contida em parte dos estados do Ceará, Piauí e Pernambuco, foi estudada em centenas de trabalhos micropaleontológicos nas últimas décadas. Contudo, poucos deles tiveram sua área de estudo no Estado de Pernambuco. No presente trabalho foram investigados microfósseis, especialmente ostracodes, provenientes de amostras do poço AR-TR-3-PE perfurado no município de Trindade. A fauna de ostracodes recuperada é tipicamente Aptiana, composta de Neuquenocypris cf. N. berthoui Colin & Dépêche, Pattersoncypris micropapillosa Bate, Pattersoncypris sp., Damonella grandiensis Tomé et al. e Theriosynoecum silvai (Silva). Esses ostracodes estão associados a outros grupos fósseis, como foraminíferos bentônicos
(Bathysiphon? sp., Rhizammina sp. e Psammosphaera? sp.), sementes, gastrópodes, bivalves e dentes de peixes. Essa associação faunística mixohalina sugere um paleoambiente transicional durante o Aptiano na porção sudoeste da Bacia do Araripe.
Palavras-chave: Eocretáceo, ostracodes, foraminíferos, paleoecologia.
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