Geologic formation in Colombia
The Simijaca Formation (Spanish : Formación Simijaca , K2 S, 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).
Simijaca Formation 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) Primary Mudstone Other Shale , sandstone , limestone Coordinates 5°29′15″N 73°50′55″W / 5.48750°N 73.84861°W / 5.48750; -73.84861 Region Altiplano Cundiboyacense Eastern Ranges , Andes Country Colombia 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 / 5.48750; -73.84861 Region Cundinamarca , Boyacá Country Colombia Thickness at type section 432 metres (1,420 ft) by Ron Blakey Show more
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]
Stratigraphy and depositional environment [ edit ] The Simijaca Formation conformably overlies the Chiquinquirá Sandstone , and the Hiló and Pacho Formations , and is overlain by the La Frontera Formation .[ 3] Turonian ,[ 1] Cenomanian .[ 4] Chipaque Formation .[ 5] open marine platform setting.[ 6] maximum flooding surface .[ 7]
Type locality of the Simijaca Formation on the Altiplano Cundiboyacense
The Simijaca Formation is apart from its type locality in the Quebrada Don Lope,[ 2] Bogotá savanna , in the Tabio anticlinal , along the road Ubaté -Carmen de Carupa ,[ 8] [ 9] Tena , south of Anolaima and Cachipay ,[ 10] Anapoima and Granada .[ 11]
^ a b c Montoya & Reyes, 2005, p.21
^ a b Acosta & Ulloa, 2001, p.38
^ Acosta & Ulloa, 2001, p.32
^ Acosta & Ulloa, 2001, p.41
^ Montoya & Reyes, 2005, p.22
^ García González et al., 2009, p.209
^ Villamil, 2012, p.164
^ Montoya & Reyes, 2005, p.23
^ Plancha 190, 2009
^ Plancha 227, 1998
^ Plancha 246, 1998
Acosta Garay, Jorge; Ulloa Melo, Carlos E. (2001), Geología de la Plancha 208 Villeta - 1:100,000 (PDF) , INGEOMINAS , pp. 1– 84, retrieved 2017-03-23 García González, Mario; Mier Umaña, Ricardo; Cruz Guevara, Luis Enrique; Vásquez, Mauricio (2009), Informe Ejecutivo - evaluación del potencial hidrocarburífero de las cuencas colombianas , Universidad Industrial de Santander , pp. 1– 219 Montoya Arenas, Diana María; Reyes Torres, Germán Alfonso (2005), Geología de la Sabana de Bogotá , INGEOMINAS , pp. 1– 104 Villamil, Tomas (2012), Chronology Relative Sea Level History and a New Sequence Stratigraphic Model for Basinal Cretaceous Facies of Colombia , Society for Sedimentary Geology (SEPM), pp. 161– 216 Ulloa, Carlos E; Rodríguez, Erasmo (2009), Plancha 170 - Vélez - 1:100,000 INGEOMINAS , p. 1, retrieved 2017-06-06 Fuquen M., Jaime A; Osorno M, José F. (2009), Plancha 190 - Chiquinquirá - 1:100,000 INGEOMINAS , p. 1, retrieved 2017-06-06 Ulloa, Carlos; Acosta, Jorge (1998), Plancha 208 - Villeta - 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 Ulloa, Carlos E; Rodríguez, Erasmo; Acosta, Jorge E. (1998), Plancha 227 - La Mesa - 1:100,000 INGEOMINAS , p. 1, retrieved 2017-06-06 Acosta, Jorge E.; Ulloa, Carlos E. (1998), Plancha 246 - Fusagasugá - 1:100,000 INGEOMINAS , p. 1, retrieved 2017-06-06 
