info:eu-repo/semantics/article
Danian (Early Paleocene) echinoids from the Roca Formation, northern Patagonia, Argentina
Fecha
2011-08Registro en:
Martínez, Sergio; del Río, Claudia Julia; Concheyro, Graciela; Danian (Early Paleocene) echinoids from the Roca Formation, northern Patagonia, Argentina; E Schweizerbartsche Verlags; Neues Jahrbuch für Geologie und Palaontologie-abhandlungen; 261; 2; 8-2011; 165-176
0077-7749
CONICET Digital
CONICET
Autor
Martínez, Sergio
del Río, Claudia Julia
Concheyro, Graciela
Resumen
Stratigraphically well-constrained echinoids from the Roca Formation in the province of Rio Negro (Patagonia, Argentina) are analysed in detail. The poorly known Linthia? joannisboehmi OPPENHEIM in BÖHM, 1903, recently reassigned to Paraster, is demonstrated to comprise in fact two distinct species, Linthia? joannisboehmi and Linthia parmae n. sp. In addition, specifically indeterminate species of Plesiaster and Hemiaster and a basal holasteroid are recorded. The analyses of calcareous nannofossil assemblages of the echinoid-bearing strata document their early Paleocene (Danian) age, which has an impact on patterns of survivorship across the K/Pg boundary.