Abstract

LECH, R.R.  and  MILANA, J.P.. A new Carboniferous mollusk record from the Tontal Range, Precordillera of San Juan. Rev. Asoc. Geol. Argent. [online]. 2006, vol.61, n.1, pp.57-62. ISSN 0004-4822.

An association of fossils mollusks integrated by Peruvispira aff. 'P'. sueroi, Nuculopsis? sp. and Limipecten sp. found in the Ciénaga Larga del Tontal Formation is reported in this contribution. This Upper Paleozoic formation crops out along part of the western slope of the Tontal Range, quite close to the highest part of it, and right to the east of the area of Rincón Blanco where Triassic deposits crop out. The two first mentioned species belong to the Fossil Zone 1, along with Aseptella ? sp., and Productella sp., while Limpecten sp. was found in the Fossil Zone 4, along with undetermined gastropods and bivalves. Taking into account the complete fossil association, and also considering the palynomorphs determined in the same formation, we estimate the age of the Ciénaga Larga del Tontal Formation to span from the late Lower Carboniferous until the late Upper Carboniferous.

Keywords : Argentina; San Juan; Tontal Mountain; Carboniferous; Mollusk.

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