Simijaca Formation

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Simijaca Formation
Stratigraphic range: Cenomanian-Turonian~
Geological formation
Villeta Group
La Frontera Formation
Chiquinquirá Sst., Churuvita Fm., Hiló Fm., Pacho Fm.
up to 693 m (2,270 ft)
Mudstone
Shale, sandstone, limestone
.mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct,.mw-parser-output .geo-inline-hidden{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}5°29′15″N 73°50′55″W / 5.48750°N 73.84861°W / 5.48750; -73.84861
Altiplano CundiboyacenseEastern Ranges, Andes
Colombia
Simijaca
Ulloa & Rodríguez
South of Simijaca
1991
5°29′15″N 73°50′55″W / 5.48750°N 73.84861°W / 5.48750; -73.84861
Cundinamarca, Boyacá
Colombia
432 metres (1,420 ft)
Paleogeography of Northern South America90 Ma, by Ron Blakey

The Simijaca Formation (Spanish: Formación Simijaca, K2S, Kss) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The predominantly mudstone formation dates to the Late Cretaceous period; Turonian and Cenomanian epochs, and has a maximum thickness of 693 metres (2,274 ft).

The formation was defined and named in 1991 by Ulloa and Rodríguez after Simijaca, Cundinamarca.

The Simijaca Formation is characterised by a sequence of mudstones, grey and black shales with sandstone and limestone intercalations.

The Simijaca Formation conformably overlies the Chiquinquirá Sandstone, and the Hiló and Pacho Formations, and is overlain by the La Frontera Formation. The age has been estimated to be Turonian, or Cenomanian. Stratigraphically, the formation is time equivalent with the Chipaque Formation. The formation has been deposited in an open marine platform setting. The deposition is represented by a maximum flooding surface.

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The Simijaca Formation is apart from its type locality in the Quebrada Don Lope, found at surface in the north of the Bogotá savanna, in the Tabio anticlinal, along the road Ubaté-Carmen de Carupa, at the western and eastern flanks of the Aponsentos-Chiquinquirá Synclinal, near Tena, south of Anolaima and Cachipay, and between Anapoima and Granada.

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Geology of the Eastern Hills Geology of the Ocetá Páramo Geology of the Altiplano Cundiboyacense

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