Geological formation in the Colombian Andes
The Cacho Formation (Spanish : Formación Cacho , E1 C, 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 400 metres (1,300 ft).
The formation was first described by Hubach in 1931 and 1957 and named by Campbell in 1962 and Julivert in 1963.[ 1] [ 2]
The Cacho Formation consists of white, yellow and reddish fine to coarse cross-bedded sandstones in thick banks intercalated with reddish and grey shales .[ 1] [ 3]
Stratigraphy and depositional environment [ edit ] The 50 to 400 metres (160 to 1,310 ft) thick Cacho Formation overlies the Guaduas Formation and is overlain by the Bogotá Formation .[ 3] 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 .[ 4]
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 .[ 2] Río Frío , Checua -Lenguazaque , Sesquilé , Sisga , Subachoque , Teusacá , Siecha , and the anticlinal of Guatavita are composed of the Cacho Formation.[ 1]
^ a b c Montoya & Reyes, 2005, p.55
^ a b Acosta & Ulloa, 2002, p.58
^ a b Guerrero Uscátegui, 1992, p.5
^ Montoya & Reyes, 2005, p.57
Acosta Garay, Jorge E.; Ulloa Melo, Carlos E. (2002), Mapa Geológico del Departamento de Cundinamarca - 1:250,000 - Memoria explicativa INGEOMINAS , pp. 1– 108, retrieved 2017-03-29 Guerrero Uscátegui, Alberto Lobo (1992), Geología e Hidrogeología de Santafé de Bogotá y su Sabana , Sociedad Colombiana de Ingenieros, pp. 1– 20 Montoya Arenas, Diana María; Reyes Torres, Germán Alfonso (2005), Geología de la Sabana de Bogotá , INGEOMINAS , pp. 1– 104 Fuquen M., Jaime A; Osorno M, José F. (2009), Plancha 190 - Chiquinquirá - 1:100,000 INGEOMINAS , p. 1, retrieved 2017-06-06 Montoya, Diana María; Reyes, Germán (2009), Plancha 209 - Zipaquirá - 1:100,000 INGEOMINAS , p. 1, retrieved 2017-06-06 Terraza, Roberto; Moreno, Giovanni; Buitrago, José A.; Pérez, Adrián; Montoya, Diana María (2010), Plancha 210 - Guateque - 1:100,000 INGEOMINAS , p. 1, retrieved 2017-06-06 Buitrago, José Alberto; Terraza M., Roberto; Etayo, Fernando (1998), Plancha 228 - Santafé de Bogotá Noreste - 1:100,000 INGEOMINAS , p. 1, retrieved 2017-06-06 
