D.1. INVERTEBRADOS DEL PALEOZOICO SUPERIOR MARINO DE LA CUENCA TEPUEL-GENOA

TABOADA, ARTURO CÉSAR; PAGANI, MARIA ALEJANDRA; PINILLA, M. KARINA; TABOADA, CÉSAR AUGUSTO; ROBLES VILCHES, ARIANA V.; PARDO, CRISTIAN A.

GEOLOGÍA Y RECURSOS NATURALES DE LA PROVINCIA DEL CHUBUT

Asociación Geológica Argentina

Lugar: CABA; Año: 2021; p. 643 - 672

The Tepuel-Genoa Basin exhibits an abundant and diverse record of fossil groups, being brachiopods,bivalves, bryozoans and gastropods the most representatives, together with subordinate occurrencesof cnidarians, echinoderms, cephalopods, hyolithids, trilobites, ostracods, scaphopods andpolyplacophors. Absence of warm-water fossils coupled with several glacial-influenced horizonscharacterize the Tepuel Group, suggesting its faunal development in cold- to cool-water seas whithinhigh paleolatitudes (~70° S) and recording the most complete polar view of the Late Paleozoic IceAge. Plentifull invertebrate fossil remains were reported from the Pampa de Tepuel, Mojón de Hierroand Río Genoa formations, while the Valle Chico and Jaramillo formations have provided scarcerecords. From base to top the all sequence displays the Globossochonetes faunule in the Valle ChicoFormation, the Lanipustula fauna in the lower half of the Pampa de Tepuel Formation and theVerchojania and Languigneotus faunas toward the upper half. The Mojón de Hierro Formation bearsthe Cimmeriella fauna in its lower half, while the upper part shows the Kochiproductus-Costatumulusfauna. The highest beds of the Mojón de Hierro Formation would be sharing with the lower part ofthe Río Genoa Formation, the Tivertonia-Costatumulus fauna, while toward the top of the unit appearthe Jakutoproductus, Piatnitzkya and Magniplicatina faunas. The whole taxonomic compositionalvariations evidence a singular faunal identity and a faunistic evolution/change coupled to a variableand dynamic paleobiogeographic linking to western and eastern Gondwana, among other regions.