GRAPTOLITOS DEL ORDOVÍCICO Y GEOLOGÍA DE LOS AFLORAMIENTOS DEL RÍO VENADO (NORTE DEL DEPARTAMENTO DEL HUILA)
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Universidad Industrial de Santander
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Una fauna fósil de graptolitos compuesta principalmente por Phyllograptus (s.l.) ssp. Fue recolectada de las secuencias del Río Venado. Los restos encontrados en Shales grises sugieren un rango de edad Floiano-Darriwiliano. Como es sugerido por las similitudes faunísticas de las secuencias de Paleozoico Temprano de Colombia, estas fueron acumuladas sobre un margen pasivo que estuvo conectado con las plataformas peruanas, bolivianas y argentinas. Adicionalmente, según los nuevos datos presentados, la nomenclatura estratigráfca usada para el Paleozoico Inferior del río Venado deberá ser enmendada.
Palabras clave: Graptolitos, Phyllograptus, Pseudophyllograptus, Ordovícico, Formación Venado.
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.
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.