The Usme Formation (, 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 .
Etymology The formation was defined by Hubach in 1957 and named after the locality of Usme, Bogotá.Montoya & Reyes, 2005, p.65
Description Lithologies The Usme Formation is subdivided into a lower sequence of shales with intercalated sandstones and an upper part of sandstones and conglomerates.
Stratigraphy and depositional environment The Usme Formation unconformably overlies the Regadera Formation and is overlain by the Tilatá Formation.Guerrero Uscátegui, 1992, p.6 The age has been estimated, based on palynological data, to be Late Eocene to Early Oligocene. The depositional environment has been interpreted as marine with the upper part deposited in a deltaic setting.Bayona et al., 2010, p.7
Outcrops
The Usme Formation is found in its type locality in the synclinal of Usme, the valley of the Tunjuelo River.
Regional correlations
See also
Geology of the Eastern Hills Geology of the Ocetá Páramo Geology of the Altiplano Cundiboyacense
Notes and references Notes
References
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