INVESTIGADORES
DEL RIO Claudia Julia
artículos
Título:
Danian (Early Paleocene) echinoids from the Roca Formation, northern Patagonia, Argentina
Autor/es:
MARTINEZ SERGIO,; DEL RIO, CLAUDIA JULIA; CONCHEYRO, ANDREA
Revista:
NEUES JAHRBUCH FUR GEOLOGIE UND PALAONTOLOGIE-ABHANDLUNGEN
Editorial:
E SCHWEIZERBARTSCHE VERLAGS
Referencias:
Lugar: Stuttgart; Año: 2011 vol. 261 p. 165 - 176
ISSN:
0077-7749
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? joannishoehmi OPPENHEIMin BOHM,1903, recently reassigned to Paraster, is demonstrated to comprise in fact two distinct species, Linthia? joannishoehmi 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.
