Resumo

RODRIGUEZ G., Gabriel  e  ZAPATA G., Gilberto. THE TATAMA CONGLOMERATES, ANEW PALEOGENE UNIT IN THE CENTRAL ZONE OF THE COLOMBIAN WESTERN CORDILLERA. Bol. cienc. tierra [online]. 2006, n.19, pp.43-55. ISSN 0120-3630.

In this research a new sedimentary conglomeratic unit is described. This unit, located in the central zone of the Colombian Western Cordillera, is informally named Tatamá Conglomerates. The origin of the Tatamá Conglomerates is fluvial/continental, with the best exposures at the páramo and pre-paramo zones. The conglomeratic unit was affected by glaciations that formed geoforms such as cirques, glacial valleys, lakes, and horns in the outcrop area The whole unit is conformed by thick layers of polymictic conglomerates and, in a minor proportion, thick layers of lithoarenites and sublithoarenites, conformed by sediments from the Penderisco Formation and, volcanic, plutonic and quartz fragments from the Barroso Formation. The sequence that makes up the Tatamá Conglomerates is over 110 meters in thickness and disconformably overlies on the Urrrao Member of the Penderisco Formation. The conglomerates have been affected by the Granodiorite of Tatamá, which has been dated between the low Paleocene and the upper Oligocene.

Palavras-chave : Conglomerates of Tatamá; Penderisco Formation; Urrao Member; Nutibara Member; Granodiorite of Tatama; Occidental Chain; National Natural Park of Tatama.

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