{{short description|Geological formation in the Colombian Andes}} {{other uses|Usme (disambiguation)}} {{Infobox rockunit | name = Usme Formation | period = Oligocene | age = Late Eocene-Early Oligocene<br />~{{fossil range|40|30}} | image = | imagesize = | caption = | type = Geological formation | prilithology = Shale, sandstone, conglomerate | otherlithology = | unitof = | subunits = | underlies = Tilatá Formation | overlies = Regadera Formation | thickness = up to {{convert|300|m|ft|abbr=on}} | area = | map = Blakey 035Ma - COL.jpg | map_caption = Paleogeography of Northern South America<br />35 Ma, {{small|by Ron Blakey}} | location = | coordinates = {{coord|4|21|40.3|N|74|07|50|W|display=inline,title}} | region = Bogotá savanna, Altiplano Cundiboyacense<br />Eastern Ranges, Andes | country = Colombia | extent = <!--{{convert||mi|km}}--> | namedfor = Usme | namedby = Hubach | year_ts = 1957 | location_ts = Usme, Bogotá | coordinates_ts = {{coord|4|21|40.3|N|74|07|50|W|display=inline}} | paleocoordinates_ts = | region_ts = Cundinamarca | country_ts = Colombia | thickness_ts = <!--{{convert||m|ft|-1}}--> }} The '''Usme Formation''' ({{langx|es|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 {{convert|300|m|ft}}.

== Etymology == The formation was defined by Hubach in 1957 and named after the locality of Usme, Bogotá.<ref name=Ingeominas_p65>Montoya & Reyes, 2005, p.65</ref>

== Description == === Lithologies === The Usme Formation is subdivided into a lower sequence of shales with intercalated sandstones and an upper part of sandstones and conglomerates.<ref name=Ingeominas_p65/>

=== Stratigraphy and depositional environment === The Usme Formation unconformably overlies the Regadera Formation and is overlain by the Tilatá Formation.<ref name=Guerrero_p6>Guerrero Uscátegui, 1992, p.6</ref> The age has been estimated, based on palynological data, to be Late Eocene to Early Oligocene.<ref name=Ingeominas_p65/> The depositional environment has been interpreted as marine with the upper part deposited in a deltaic setting.<ref name=Bayona_p7>Bayona et al., 2010, p.7</ref>

== Outcrops == {{Location map | Bogotá savanna | width = 250 | lat_deg = 4.361195 | lon_deg = -74.130564 | label = | float = left | position = right | mark = Orange pog.svg | marksize = 12 | caption = Type locality of the Usme Formation to the south of the Bogotá savanna }} The Usme Formation is found in its type locality in the synclinal of Usme, the valley of the Tunjuelo River.<ref name=Ingeominas_p65/>

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== Regional correlations == {{Stratigraphy of the Llanos Basin}}

== See also == {{Portal|Colombia|Geology}} :{{icon|FAC}} Geology of the Eastern Hills :{{icon|B}} Geology of the Ocetá Páramo :{{icon|C}} Geology of the Altiplano Cundiboyacense

== Notes and references == === Notes === {{reflist|group=note}}

=== References === {{reflist|30em}}

=== Bibliography === * {{citation |last1=Bayona |first1=Germán |last2=Montenegro |first2=Omar |last3=Cardona |first3=Agustín |last4=Jaramillo |first4=Carlos |last5=Lamus |first5=Felipe |last6=Morón |first6=Sara |last7=Quiroz |first7=Luiz |last8=Ruíz |first8=María C. |last9=Valencia and Mauricio Parra |first9=Victor |year=2010 |title=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 |url=http://www.bdigital.unal.edu.co/24001/1/21100-118170-1-PB.pdf |journal=Geología Colombiana |volume=35 |pages=5–35 |accessdate=2017-03-16 |archive-date=2017-03-30 |archive-url=https://web.archive.org/web/20170330092104/http://www.bdigital.unal.edu.co/24001/1/21100-118170-1-PB.pdf |url-status=dead }} * {{citation |last=Guerrero Uscátegui |first=Alberto Lobo |year=1992 |title=Geología e Hidrogeología de Santafé de Bogotá y su Sabana |publisher=Sociedad Colombiana de Ingenieros |pages=1–20}} * {{citation |last1=Montoya Arenas |first1=Diana María |last2=Reyes Torres |first2=Germán Alfonso |year=2005 |title=Geología de la Sabana de Bogotá |publisher=INGEOMINAS |pages=1–104}}

==== Maps ==== * {{citation |last1=Acosta |first1=Jorge E. |last2=Ulloa |first2=Carlos E. |year=1998 |title=Plancha 246 - Fusagasugá - 1:100,000 |url=https://drive.google.com/open?id=0BwFQPMJEi17QNkY5UEloZU9pdEk |publisher=INGEOMINAS |pages=1 |accessdate=2017-06-06}}

== External links == * {{citation |last1=Gómez |first1=J. |last2=Montes |first2=N.E. |last3=Nivia |first3=Á. |last4=Diederix |first4=H. |year=2015 |title=Plancha 5-09 del Atlas Geológico de Colombia 2015 – escala 1:500,000 |url=https://www.researchgate.net/publication/309533589 |publisher=Servicio Geológico Colombiano |pages=1 |accessdate=2017-03-16}}

Category:Geologic formations of Colombia Category:Paleogene Colombia Category:Eocene Series of South America Category:Oligocene Series of South America Category:Tinguirirican Category:Divisaderan Category:Lutetian Stage Category:Priabonian Stage Category:Rupelian Stage Category:Sandstone formations Category:Shale formations Category:Deltaic deposits Formations Formations Formations