Abstract

MORENO SANCHEZ, Mario; GOMEZ CRUZ, Arley de Jesus  and  CASTILLO GONZALEZ, Hardany. EARLY ORDOVICIAN GRAPTOLITE AND GEOLOGY OF THE OUTCROPS OF VENADO RIVER (HUILA REGION). bol.geol. [online]. 2008, vol.30, n.1, pp. 9-19. ISSN 0120-0283.

A graptolite faunal, composed dominantly by the genus Phyllograptus (s.l.) ssp., was recovered from the Venado River sequences. The remains, found in grey shales, suggest a Floian-Darriwilian age. As it is suggested by faunal similarities, Early Paleozoic sequences of Colombia were deposited on a passive margin that was connected with Peruvian, Bolivian and Argentinean platform. Furthermore, on the basis of these new data, it is found that stratigraphy nomenclature currently used for the Early Paleozoic series of the Venado River has to be emendated.

Keywords : Graptolite; Phyllograptus; Pseudophyllograptus; Ordovician; Venado Formation.