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.

在宾夕法尼亚时期，冰室冰川平衡和西冈瓦纳的退化导致了位于现代南美洲的伊泰图巴-皮奥伊陆表海的广泛海侵-海退循环。这条海道从最远端和西部的索利莫斯盆地延伸到亚马逊盆地中部，有时还延伸到最东部和受限制的帕尔纳伊巴盆地。这些盆地含有丰富多样的海洋（例如无脊椎动物、牙形刺、有孔虫）和大陆（植物花粉-孢子组合）化石。本文介绍了从 Carauari（索利莫斯盆地）、Itaituba（亚马逊盆地）和 Piauí（帕纳伊巴盆地）地层的露头和井中回收的牙形刺。从这些地层中发现的牙形刺包括Idiognathodus、Neognathodus、Adetognathus、Idiognathoides、Diplognathodus、Declinognathodus和Hindeodus 。在三个研究盆地之间，这种宾夕法尼亚牙形刺组合的生物地层相关性是可能的。当伊泰图巴-皮奥伊海淹没这些盆地时，带有牙形刺的海洋单位可以识别海侵事件。