| Period | Oligocene |
|---|---|
| Age | Late Eocene-Early Oligocene ~ |
| Prilithology | Shale, sandstone, conglomerate |
| Underlies | Tilatá Formation |
| Overlies | Regadera Formation |
| Thickness | up to 300 m (980 ft) |
| Coordinates | 4°21′40.3″N 74°07′50″W |
| Region | Bogotá savanna, Altiplano Cundiboyacense Eastern Ranges, Andes |
| Country | Colombia |
| Namedfor | Usme |
| Namedby | Hubach |
| Year ts | 1957 |
| Location ts | Usme, Bogotá |
| Coordinates ts | 4°21′40.3″N 74°07′50″W |
| Region ts | Cundinamarca |
| Country ts | Colombia |
The Usme Formation (Spanish: Formación Usme, Tsu, Teu) is a geological formation of the Bogotá savanna, Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists of a lower part with predominantly shales with intercalated sandstone beds and an upper sequence with sandstones and conglomerates. The Usme Formation dates to the Neogene and Paleogene periods; Late Eocene to Early Oligocene epochs, and has a maximum thickness of 300 metres (980 ft).
Etymology
The formation was defined by Hubach in 1957 and named after the locality of Usme, Bogotá.[1]
Description
Lithologies
The Usme Formation is subdivided into a lower sequence of shales with intercalated sandstones and an upper part of sandstones and conglomerates.[1]
Stratigraphy and depositional environment
The Usme Formation unconformably overlies the Regadera Formation and is overlain by the Tilatá Formation.[2] The age has been estimated, based on palynological data, to be Late Eocene to Early Oligocene.[1] The depositional environment has been interpreted as marine with the upper part deposited in a deltaic setting.[3]
Outcrops
The Usme Formation is found in its type locality in the synclinal of Usme, the valley of the Tunjuelo River.[1]
See also
Notes and references
References
Bibliography
- Bayona, Germán; Montenegro, Omar; Cardona, Agustín; Jaramillo, Carlos; Lamus, Felipe; Morón, Sara; Quiroz, Luiz; Ruíz, María C.; Valencia and Mauricio Parra, Victor (2010), "Estratigrafía, procedencia, subsidencia y exhumación de las unidades paleógenas en el Sinclinal de Usme, sur de la zona axial de la Cordillera Oriental - Stratigraphy, provenance, subsidence and exhumation of the Paleogene succession in the Usme Syncline, southern axial zone of the Eastern Cordillera", Geología Colombiana. 35: 5–35, archived from the original on 2017-03-30, retrieved 2017-03-16
- Guerrero Uscátegui, Alberto Lobo (1992), "Geología e Hidrogeología de Santafé de Bogotá y su Sabana", Sociedad Colombiana de Ingenieros, pp. 1–20
- Montoya Arenas, Diana María & Reyes Torres, Germán Alfonso (2005), "Geología de la Sabana de Bogotá", INGEOMINAS, pp. 1–104
Maps
- Acosta, Jorge E. & Ulloa, Carlos E. (1998), "Plancha 246 - Fusagasugá - 1:100,000", INGEOMINAS, p. 1, retrieved 2017-06-06
External links
- Gómez, J.; Montes, N.E.; Nivia, Á.; Diederix, H. (2015), "Plancha 5-09 del Atlas Geológico de Colombia 2015 – escala 1:500,000", Servicio Geológico Colombiano, p. 1, retrieved 2017-03-16