IANIGLA   20881
INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
artículos
Título:
Nuevas observaciones sistemáticas de los graptolitos de la Formación Empozada, “Colección Rusconi”, Ordovícico Superior de la Precordillera de Mendoza, Argentina.
Autor/es:
TORO, B.A.; BRUSSA, E.D.
Revista:
AMEGHINIANA
Editorial:
Asociación Paleontológica Argentina
Referencias:
Lugar: Buenos Aires; Año: 2007 vol. 44 p. 231 - 231
ISSN:
0002-7014
Resumen:
Abstract. NEW SYSTEMATIC INSIGHTS ABOUT THE GRAPTOLITES OF THE “RUSCONI COLLECTION” FROM THE LATE ORDOVICIAN EMPOZADA FORMATION, PRECORDILERA OF MENDOZA, ARGENTINA. The holotypes, paratypes and the best preserved material of twenty graptolite taxa proposed by Rusconi, and deposited in the “Juan Cornelio Moyano” Natural and Anthropological Sciences Museum of Mendoza were reviewed. The fossils, which were collected from sedimentary deposits of the Empozada Formation outcropping in the San Isidro area, located in the Precordillera close to Mendoza city, were compared with the specimens collected by the authors at the same unit. This paper deals with the reasons to invalidate the followings taxa: Desmograptus australis (Rusconi 1949a), Tetragraptus bueyensis (Rusconi 1949e), Dichograptus quebradensis (Rusconi 1948), Pterograptus longissimus (Rusconi 1949d), Cryptograptus crassispinus (Rusconi 1949c), Mendograptus inversus (Rusconi 1948), Monograptus bayensis (Rusconi 1949a), Glyptograptus cuyanensis (Rusconi 1949e), Glyptograptus cuyunchensis (Rusconi 1950a) and Janograptus simplicidentatus (Rusconi 1949e); in addition, reasons for the doubtful classification of the following taxa are also discussed: Janograptus alfaensis (Rusconi 1949e), Janograptus australis (Rusconi 1949e) and Janograptus bueyensis (Rusconi 1949e). Moreover, the descriptions of reassigned taxa such as: Thamnograptus sp., Climacograptus tubuliferus Lapworth, Orthoretiolites aff. hami Whittington, Hallograptus sp. and Plegmatograptus sp. are given. Corynoides sp. and Dicellograptus cf. minor Toghill are reported and described for the first time for the Empozada Formation. Finally, new information about the recognized graptolite assemblages and the biostratigraphic implications is also discussed.