Macroinvertebrates of the Capivari marine bed, late Paleozoic glacial Itararé Group, northeast Paraná Basin, Brazil: Paleoenvironmental and paleogeographic implications

SIMÕES, MARCELLO GUIMARÃES; NEVES, JACQUELINE PEIXOTO; TABOADA, ARTURO CÉSAR; PAGANI, MARIA ALEJANDRA; VAREJAO, FILIPE, G.; ASSINE, MARIO, L.

JOURNAL OF SOUTH AMERICAN EARTH SCIENCES

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2020 vol. 98

0895-9811

A 2-m-thick silty shale bed within the Taciba Formation, Itararé Group, Paraná Basin, State of São Paulo,southeastern Brazil, records marine sedimentation in a siliciclastic-dominated, low-energy, shelf setting, during ashort-lived deglacial event. The bed is located 100?150 m below the base of the lower Permian, post-glacialTatui Formation. The marine assemblage is dominated by rhynchonelliform brachiopods, with subordinate bivalves,gastropods and crinoids, recording the highest phylum-level diversity so far identified within a givenfossil-bearing horizon in the uppermost portion of the Itararé Group. Two new species are described, one brachiopodBiconvexiella saopauloensis and one gastropod Peruvispira brasilensis. Additionally, shells of Lyonia rochacamposi,Rhynchopora grossopunctata, Quinquenella rionegrensis, Phestia tepuelensis, Streblopteria aff. S. lagunensis,Limipecten capivariensis, Praeundulomya cf. subelongata and Mourlonia (Woolnoughia)? sp. are identified.Crinoid columns were assigned to øPentaridica sp. (a genus based on elements of the columnal). This is the firstsystematic description of members of the Eurydesma-Lyonia fauna in the northeastern part of the Paraná Basin,Brazil. The overwhelming majority of brachiopods belong to Biconvexiella saopauloensis, followed byRhynchopora grossopunctata. The record of Lyonia rochacamposi closely resembles that of the uppermost part ofthe Taciba Formation in southern Brazil. Hence, the Capivari marine fauna correlates approximately with that ofthe upper part of the Taciba Formation. Lyonia rochacamposi also indicates correlation with Permian units of theSauce Grande-Colorado (Argentina), Huab (Hardap shale of the Dwyka Group), Aranos area (Namibia), southwestAfrica, and the Carnavon (Western Australia) basins. These correlations support a latest Asselian-earliestSakmarian age for the fauna.