The Simijaca Formation (, 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 .
Etymology The formation was defined and named in 1991 by Ulloa and Rodríguez after Simijaca, Cundinamarca.Montoya & Reyes, 2005, p.21
Description Lithologies The Simijaca Formation is characterised by a sequence of mudstones, grey and black shales with sandstone and limestone intercalations.
Stratigraphy and depositional environment The Simijaca Formation conformably overlies the Chiquinquirá Sandstone, and the Hiló and Pacho Formations, and is overlain by the La Frontera Formation.Acosta & Ulloa, 2001, p.32 The age has been estimated to be Turonian, or Cenomanian.Acosta & Ulloa, 2001, p.41 Stratigraphically, the formation is time equivalent with the Chipaque Formation.Montoya & Reyes, 2005, p.22 The formation has been deposited in an open marine platform setting.García González et al., 2009, p.209 The deposition is represented by a maximum flooding surface.Villamil, 2012, p.164
Outcrops
The Simijaca Formation is apart from its type locality in the Quebrada Don Lope,Acosta & Ulloa, 2001, p.38 found at surface in the north of the Bogotá savanna, in the Tabio anticlinal, along the road Ubaté-Carmen de Carupa,Montoya & Reyes, 2005, p.23 at the western and eastern flanks of the Aponsentos-Chiquinquirá Synclinal,Plancha 190, 2009 near Tena, south of Anolaima and Cachipay,Plancha 227, 1998 and between Anapoima and Granada.Plancha 246, 1998
See also
Geology of the Eastern Hills Geology of the Ocetá Páramo Geology of the Altiplano Cundiboyacense
References
Bibliography
Maps
External links