Simijaca Formation | |
---|---|
Stratigraphic range:
Cenomanian-
Turonian ~ | |
Type | Geological formation |
Unit of | Villeta Group |
Underlies | La Frontera Formation |
Overlies | Chiquinquirá Sst., Churuvita Fm., Hiló Fm., Pacho Fm. |
Thickness | up to 693 m (2,270 ft) |
Lithology | |
Primary | Mudstone |
Other | Shale, sandstone, limestone |
Location | |
Coordinates | 5°29′15″N 73°50′55″W / 5.48750°N 73.84861°W |
Region |
Altiplano Cundiboyacense Eastern Ranges, Andes |
Country | Colombia |
Type section | |
Named for | Simijaca |
Named by | Ulloa & Rodríguez |
Location | South of Simijaca |
Year defined | 1991 |
Coordinates | 5°29′15″N 73°50′55″W / 5.48750°N 73.84861°W |
Region | Cundinamarca, Boyacá |
Country | Colombia |
Thickness at type section | 432 metres (1,420 ft) |
Paleogeography of Northern South America 90 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. [1]
The Simijaca Formation is characterised by a sequence of mudstones, grey and black shales with sandstone and limestone intercalations. [1] [2]
The Simijaca Formation conformably overlies the Chiquinquirá Sandstone, and the Hiló and Pacho Formations, and is overlain by the La Frontera Formation. [3] The age has been estimated to be Turonian, [1] or Cenomanian. [4] Stratigraphically, the formation is time equivalent with the Chipaque Formation. [5] The formation has been deposited in an open marine platform setting. [6] The deposition is represented by a maximum flooding surface. [7]
The Simijaca Formation is apart from its type locality in the Quebrada Don Lope, [2] found at surface in the north of the Bogotá savanna, in the Tabio anticlinal, along the road Ubaté- Carmen de Carupa, [8] at the western and eastern flanks of the Aponsentos-Chiquinquirá Synclinal, [9] near Tena, south of Anolaima and Cachipay, [10] and between Anapoima and Granada. [11]
Simijaca Formation | |
---|---|
Stratigraphic range:
Cenomanian-
Turonian ~ | |
Type | Geological formation |
Unit of | Villeta Group |
Underlies | La Frontera Formation |
Overlies | Chiquinquirá Sst., Churuvita Fm., Hiló Fm., Pacho Fm. |
Thickness | up to 693 m (2,270 ft) |
Lithology | |
Primary | Mudstone |
Other | Shale, sandstone, limestone |
Location | |
Coordinates | 5°29′15″N 73°50′55″W / 5.48750°N 73.84861°W |
Region |
Altiplano Cundiboyacense Eastern Ranges, Andes |
Country | Colombia |
Type section | |
Named for | Simijaca |
Named by | Ulloa & Rodríguez |
Location | South of Simijaca |
Year defined | 1991 |
Coordinates | 5°29′15″N 73°50′55″W / 5.48750°N 73.84861°W |
Region | Cundinamarca, Boyacá |
Country | Colombia |
Thickness at type section | 432 metres (1,420 ft) |
Paleogeography of Northern South America 90 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. [1]
The Simijaca Formation is characterised by a sequence of mudstones, grey and black shales with sandstone and limestone intercalations. [1] [2]
The Simijaca Formation conformably overlies the Chiquinquirá Sandstone, and the Hiló and Pacho Formations, and is overlain by the La Frontera Formation. [3] The age has been estimated to be Turonian, [1] or Cenomanian. [4] Stratigraphically, the formation is time equivalent with the Chipaque Formation. [5] The formation has been deposited in an open marine platform setting. [6] The deposition is represented by a maximum flooding surface. [7]
The Simijaca Formation is apart from its type locality in the Quebrada Don Lope, [2] found at surface in the north of the Bogotá savanna, in the Tabio anticlinal, along the road Ubaté- Carmen de Carupa, [8] at the western and eastern flanks of the Aponsentos-Chiquinquirá Synclinal, [9] near Tena, south of Anolaima and Cachipay, [10] and between Anapoima and Granada. [11]