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First occurrence of Ellisonia, Gondolella and Ubinates (Conodonts) in Itaituba Formation, Pennsylvanian of Amazonas Basin, Brazil

2010; UNIVERSIDADE DO VALE DO RIO DOS SINOS; Volume: 6; Issue: 2 Linguagem: Inglês

10.4013/gaea.2010.62.01

1983-3628

Sara Nascimento, Valesca Brasil Lemos, Ana Karina Scomazzon, Nilo Siguehiko Matsuda, Cristiane da Silva,

Paleontology and Stratigraphy of Fossils

This paper analyzes and describes a fi rst occurrence of the conodonts Ellisonia, Gondolella and Ubinates in Amazonas Basin, North of Brazil. The recovered material comes from two outcrops along the Tapajos River and from a limestone quarry of Itaituba Formation, whose levels are included in the Itaituba Formation, with a Pennsylvanian age. Those conodonts are relevant paleoecological indicators of water depth, salinity and environmental energy and have implications in the Late Carboniferous to Triassic biostratigraphy. The fossil remains represent M and S conodont elements, associated to Pa elements of the Idiognathodus, Idiognathoides, Neognathodus, Adetognathus, Hindeodus and Diplognathodus genus. Key words: conodonts, Amazonas Basin, Itaituba Formation, Pennsylvanian.