Conodonts paleobiogeographic dynamic of the Pennsylvanian epicontinental sea Itaituba-Piauí, in the northern intracratonic Brazilian basins, Western Gondwana

During the Pennsylvanian, icehouse glacioeustasy and the debasement of Western Gondwana caused widespread transgressive-regressive cycles in the Itaituba-Piauí epicontinental sea located in modern-day South America. This seaway extended from the most distal and western Solimões basin, into the medial Amazonas basin, and at times into the most eastern and restricted Parnaíba basin. These basins contain a rich variety of marine (e.g., invertebrates, conodonts, foraminifers) and continental (plant pollen-spore assemblages) fossils. This paper presents the conodonts retrieved from outcrops and wells in the Carauari (Solimões Basin), Itaituba (Amazonas Basin), and the Piauí (Parnaíba Basin) formations. The conodonts recovered from these formations include Idiognathodus, Neognathodus, Adetognathus, Idiognathoides, Diplognathodus, Declinognathodus, and Hindeodus. Biostratigraphic correlation of this Pennsylvanian conodont assemblage is possible between the three studied basins. The conodont-bearing marine units can identify transgression episodes when the Itaituba-Piauí sea inundated these basins.