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New Devonian fossil localities in Bolivia

1996; Elsevier BV; Volume: 9; Issue: 5-6 Linguagem: Inglês

10.1016/s0895-9811(96)00015-6

1873-0647

Alain Blieck, Pierre-Yves Gagnier, Francoise P. Bigey, Gregory D. Edgecombe, Philippe Janvier, Stanislas Loboziak, P.R. Rachebȩuf, Thierry Sempéré, Philippe Steemans,

Marine Biology and Ecology Research

Abstract An examination of Palaeozoic sections west of Cochabamba, and west of Lake Poopo, in western Bolivia, was conducted during a field expedition in 1991. The Rio Iglesiani valley, west of Cochabamba, surprisingly yielded a Middle Devonian age to all the visited sites, originally supposed to be Ordovician. This result is based on spores, shelly faunas (brachiopods and bivalves), and trilobites. The Copacabana de Andamarca section, west of Lake Poopo, is also dated as Middle Devonian on account of its rather rich fauna (bryozoans, corals, brachiopods, conulariids, hyolithids, tentaculitids, ostracodes, trilobites, crinoids, vertebrates). Both localities correlate to the Icla and/or Huamampampa Formation of the Tarabuco area and Subandean belt, and to the Belen and/or Sica Sica Formation of the northern Altiplano.