INVESTIGADORES
CISTERNA Gabriela Adriana
artículos
Título:
Permian brachiopods from the Tupe Formation, San Juan Province, Precordillera, Argentina
Autor/es:
CISTERNA, G.A., SIMANAUSKAS, T. & ARCHBOLD, N.W.
Revista:
ALCHERINGA
Editorial:
TAYLOR & FRANCIS LTD
Referencias:
Lugar: Sydney; Año: 2002 vol. 26 p. 177 - 200
ISSN:
0311-5518
Resumen:
The brachiopod fauna from the Tupe Formation at La Herradura Creek, located on the
west flank of Perico Hill, San Juan Province, Argentina, palaeogeographically belongs
to the western sector of the Paganzo basin ('Guandacol embayment'). The stratigraphical
section of the Tupe Formation at La Herradura Creek is the stratotype of the Tivertonia
jachalensis-So'eptorhynchus inaequiornatus biozone, was previously regarded as being
of Late Carboniferous age but here is assigned to the earliest Permian (Asselian). We
describe and review the biozone assemblage, which consists of Streptorhynchus
inaequiornatus, Tivertonia jachalensis, Kochiproductus sp., Costatumulus sp.,
Coronalosia argentinensis, Tupelosia paganzoensis, Trigonotreta pericoensis,
Septosyringothyris sp. aff. Septosyringothyris jaguelensis and Crurithyris? sp. This
brachiopod assemblage is related to Indian and Australian Early Permian faunas and its
presence in the La Herradura Creek section provides new evidence in support of an
Asselian (Early Permian) age for the Tivertonia jachalensis-Streptorhynchus
inaequiornatus biozone. This assemblage is also important for intra- and inter-basinal
correlation because several of its characteristic species have been identified from other
sections of the Paganzo basin and the Rio Blanco basin. The proposed age for this
biozone is consistent with the age of palynological data from slightly above the marine
faunas from the stratotype locality.