Cacho Formation
{{Short description|Geological formation in the Colombian Andes}}
{{Infobox rockunit
| name = Cacho Formation
| period = Paleocene
| age = Mid-Late Paleocene
~{{fossil range|60|55}}
| image =
| imagesize =
| caption =
| type = Geological formation
| prilithology = Sandstone
| otherlithology = Shale
| unitof =
| subunits =
| underlies = Bogotá Formation
| overlies = Guaduas Formation
| thickness = {{convert|50|-|400|m|ft|abbr=on}}
| area =
| map =
| map_caption =
| location =
| coordinates = {{coord|4|35|11.4|N|74|14|25.8|W|display=inline,title}}
| region = Bogotá savanna
Altiplano Cundiboyacense
Eastern Ranges
Andes
| country = {{COL}}
| extent =
| namedfor =
| namedby = Julivert
| year_ts = 1963
| location_ts = Soacha
| coordinates_ts = {{coord|4|35|11.4|N|74|14|25.8|W|display=inline}}
| paleocoordinates_ts =
| region_ts = Cundinamarca
| country_ts = {{COL}}
| thickness_ts =
}}
The Cacho Formation ({{langx|es|Formación Cacho}}, E1C, Tpc, Tec) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The predominantly sandstone formation with thin intercalated beds of shales dates to the Paleogene period; Middle to Late Paleocene epochs, and has a maximum thickness of {{convert|400|m|ft}}.
Definition
The formation was first described by Hubach in 1931 and 1957 and named by Campbell in 1962 and Julivert in 1963.Montoya & Reyes, 2005, p.55Acosta & Ulloa, 2002, p.58
Description
= Lithologies =
= Stratigraphy and depositional environment =
The {{convert|50|to|400|m|ft}} thick Cacho Formation overlies the Guaduas Formation and is overlain by the Bogotá Formation.Guerrero Uscátegui, 1992, p.5 The age has been estimated to be Late Paleocene, based on paleoflora studied by Thomas van der Hammen in 1957. The formation is laterally equivalent to the Lower Socha and Barco Formations.Montoya & Reyes, 2005, p.57
Outcrops
{{Location map | Bogotá savanna
| width = 250
| lat_deg = 4.586510
| lon_deg = -74.240504
| label =
| float = left
| position = right
| mark = Orange pog.svg
| marksize = 12
| caption = Type locality of the Cacho Formation in the south of the Bogotá savanna
}}
The Cacho Formation is apart from its type locality in Soacha, found in the Eastern Hills of Bogotá, and many other locations in the Eastern Ranges up until the south of Boyacá. The synclinals of the Río Frío, Checua-Lenguazaque, Sesquilé, Sisga, Subachoque, Teusacá, Siecha, and the anticlinal of Guatavita are composed of the Cacho Formation.
{{clear}}
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
{{clear}}
References
{{reflist|30em}}
= Bibliography =
- {{citation |last1=Acosta Garay |first1=Jorge E. |last2=Ulloa Melo |first2=Carlos E. |year=2002 |title=Mapa Geológico del Departamento de Cundinamarca - 1:250,000 - Memoria explicativa |url=http://nebula.wsimg.com/ca3411dab87400d504f8461f0256772a?AccessKeyId=75F883B260454DDA3D4B&disposition=0&alloworigin=1 |publisher=INGEOMINAS |pages=1–108 |accessdate=2017-03-29}}
- {{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=Fuquen M. |first1=Jaime A |last2=Osorno M |first2=José F. |year=2009 |title=Plancha 190 - Chiquinquirá - 1:100,000 |url=https://drive.google.com/open?id=0BwFQPMJEi17QVEYzMnV1ekNxTDQ |publisher=INGEOMINAS |pages=1 |accessdate=2017-06-06}}
- {{citation |last1=Montoya |first1=Diana María |last2=Reyes |first2=Germán |year=2009 |title=Plancha 209 - Zipaquirá - 1:100,000 |url=https://drive.google.com/open?id=0BwFQPMJEi17QYUdHRWFiN1JrVms |publisher=INGEOMINAS |pages=1 |accessdate=2017-06-06}}
- {{citation |last1=Terraza |first1=Roberto |last2=Moreno |first2=Giovanni |last3=Buitrago |first3=José A. |last4=Pérez |first4=Adrián |last5=Montoya |first5=Diana María |year=2010 |title=Plancha 210 - Guateque - 1:100,000 |url=https://drive.google.com/open?id=0BwFQPMJEi17QS1VHUTg1MEpNcHM |publisher=INGEOMINAS |pages=1 |accessdate=2017-06-06}}
- {{citation |last1=Buitrago |first1=José Alberto |last2=Terraza M. |first2=Roberto |author3-link=Fernando Etayo |last3=Etayo |first3=Fernando |year=1998 |title=Plancha 228 - Santafé de Bogotá Noreste - 1:100,000 |url=https://drive.google.com/open?id=0BwFQPMJEi17QTlNraVVZZ2ZCY0E |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:Paleocene Series of South America