| Usme Formation | |
| Period: | Oligocene |
| Age: | Late Eocene-Early Oligocene ~ |
| Type: | Geological formation |
| Prilithology: | Shale, sandstone, conglomerate |
| Underlies: | Tilatá Formation |
| Overlies: | Regadera Formation |
| Thickness: | up to 300m (1,000feet) |
| Map: | Blakey 035Ma - COL.jpg |
| Coordinates: | 4.3612°N -74.1306°W |
| Region: | Bogotá savanna, Altiplano Cundiboyacense Eastern Ranges, Andes |
| Namedfor: | Usme |
| Namedby: | Hubach |
| Year Ts: | 1957 |
| Location Ts: | Usme, Bogotá |
| Coordinates Ts: | 4.3612°N -74.1306°W |
| Region Ts: | Cundinamarca |
The Usme Formation (Spanish; Castilian: 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 300m (1,000feet).
The formation was defined by Hubach in 1957 and named after the locality of Usme, Bogotá.[1]
The Usme Formation is subdivided into a lower sequence of shales with intercalated sandstones and an upper part of sandstones and conglomerates.[1]
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]
The Usme Formation is found in its type locality in the synclinal of Usme, the valley of the Tunjuelo River.[1]
Geology of the Eastern Hills
Geology of the Ocetá Páramo
Geology of the Altiplano Cundiboyacense