The Une Formation ( es, Formación Une, Kiu) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the

Colombia Colombia (, ; ), officially the Republic of Colombia, is a country in South America with insular regions in North America—near Nicaragua's Caribbean coast—as well as in the Pacific Ocean. The Colombian mainland is bordered by the Car ...

n Andes. The predominantly sandstone formation dates to the Middle Cretaceous period; Albian to

Cenomanian The Cenomanian is, in the ICS' geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the lowest stage of the Upper Cretaceous Series. An age is a unit of geochronology; it is a unit of time; the stage is a unit in the s ...

epochs and has a maximum thickness of .

Etymology

The formation was defined in 1957 by Hubach after Une, Cundinamarca.Acosta & Ulloa, 2002, p.53

Description

Lithologies

The Une Formation has a maximum thickness of and is characterised by a sequence of sandstones.Acosta & Ulloa, 2002, p.54 Fossils of '' Heminautilus etheringtoni'' have been found in the Une Formation.Badouin et al., 2016, p.87

Stratigraphy and depositional environment

The Une Formation, part of the Villeta Group, overlies the

Fómeque Formation The Fómeque Formation ( es, Formación Fómeque, Kif) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The predominantly organic shale formation dates to the Early Cretaceous period; Barremian to ...

and is overlain by the

Chipaque Formation The Chipaque Formation ( es, Formación Chipaque, K2cp, Kc) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation is also described as Gachetá Formation, named after Gachetá, in the area o ...

. The age has been estimated to be Albian-

. Stratigraphically, the formation is time equivalent with the Simijaca, Aguardiente, Caballos and

Pacho Formation The Pacho Formation ( es, Limolitas de Pacho, Kslp) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consisting of alternating siltstones and shales with siderite concretions dates to t ...

s. The formation has been deposited in a near shore deltaic environment.Acosta & Ulloa, 2002, p.46

Outcrops

The Une Formation is apart from its

type locality Type locality may refer to: * Type locality (biology) * Type locality (geology) See also * Local (disambiguation) * Locality (disambiguation) {{disambiguation ...

, found on the

Sumapaz Páramo Sumapaz Páramo (Spanish: ''Páramo de Sumapaz'' - meaning "Utterly peaceful moorland" ) is a large páramo ecosystem located in the Altiplano Cundiboyacense mountain range, considered the largest páramo ecosystem in the world. It was de ...

Regional correlations

Notes

References

Bibliography

* * * *

Maps

* * * * * * * * * * * * *

External links

* {{cite LSA , last=Gómez , first=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_Plancha_5-09_del_Atlas_Geologico_de_Colombia_2015 , publisher=

Servicio Geológico Colombiano The Colombian Geological Survey (CGS) ( es, Servicio Geológico Colombiano; formerly known as INGEOMINAS) is a scientific agency of the Colombian government in charge of contributing to the socioeconomic development of the nation through research ...

, pages=1 , accessdate=2017-03-16 Geologic formations of Colombia Cretaceous Colombia Upper Cretaceous Series of South America Lower Cretaceous Series of South America Albian Stage Cenomanian Stage Sandstone formations Deltaic deposits Shallow marine deposits Reservoir rock formations Formations Geography of Cundinamarca Department Geography of Boyacá Department Muysccubun