MACNBR   00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
artículos
Título:
Danian (Early Paleocene) echinoids from the Roca Formation,northern Patagonia
Autor/es:
DEL RIO, C. CONCHEYRO, Y MARTINEZEZ, S.
Revista:
NEUES JAHRBUCH FUR GEOLOGIE UND PALAONTOLOGIE-ABHANDLUNGEN
Editorial:
E SCHWEIZERBARTSCHE VERLAGS
Referencias:
Lugar: Stuttgart; Año: 2011 vol. 261 p. 165 - 165
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? joannisbohemi recently to reassigned to Parster,is demonstrated to comprise in fact two distinct species, Linthia joannisbohemi and Linthia parmae n.sp. In addition , especifically indeterminate species of Plesiaster and Hemiaster and a basal holoasteroid are recorded. The analyses of calcareous nanofossil assemblages of the echinoid -bearing strata document their early Paleocene ( Danian) age, which was an impact on patterns of survirvorship across the K/Pg boundary.