The Socotá Formation (Spanish: Formación Socotá, Kis) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consisting of a lower unit of calcareous sandstones and an upper sequence of shales dates to the Early Cretaceous period; Late Aptian epoch and in Quipile has a measured thickness of 255 metres (837 ft) with large regional variations. The formation hosts ammonite fossils.
| Socotá Formation | |
|---|---|
| Stratigraphic range: Late Aptian ~ | |
| Type | Geological formation |
| Unit of | Villeta Group |
| Underlies | El Peñón Fm., Hiló Fm., Capotes Fm. |
| Overlies | Trincheras Formation |
| Thickness | more than 255 m (837 ft) |
| Lithology | |
| Primary | Sandstone |
| Other | Shale |
| Location | |
| Coordinates | 4°31′19″N 74°33′06″W / 4.52194°N 74.55167°W |
| Region | Altiplano Cundiboyacense Eastern Ranges, Andes |
| Country |  Colombia |
| Type section | |
| Named for | Socotá, Apulo |
| Named by | Cáceres & Etayo |
| Location | Apulo |
| Year defined | 1969 |
| Coordinates | 4°31′19″N 74°33′06″W / 4.52194°N 74.55167°W |
| Region | Cundinamarca |
| Country | Colombia |
 Paleogeography of Northern South America 120 Ma, by Ron Blakey | |
Etymology edit
The formation was defined as a thicker sequence and named in 1969 by Cáceres and Etayo after Socotá, a vereda of Apulo, Cundinamarca.[1] The name Socotá in Muysccubun, the language of the native Muisca, means either "Land of the Sun and farmfields" or "Good harvest".[2]
Description edit
Lithologies edit
The Socotá Formation has a maximum thickness of 600 metres (2,000 ft), and is characterised by a lower sequence of calcareous sandstones and an upper part of shales. Fossils of the ammonites Stoyanowiceras treffryanus, Dufrenoyia sanctorum, Parahoplites (?) hubachi, and Acanthoplites (?) leptoceratiforme have been found in the Socotá Formation.[1]
Stratigraphy and depositional environment edit
The Socotá Formation overlies the Trincheras Formation and is partly overlain by and partly time equivalent with the El Peñón Formation.[3] In other areas, the formation underlies the Capotes and Hiló Formations.[4][5] The age has been estimated to be Late Aptian. Stratigraphically, the formation is time equivalent with the Tablazo, Caballos and Une Formations.[4][6] The formation has been deposited in a marine platform environment.[1] in terms of sequence stratigraphy, the Socotá Formation is part of a transgressive cycle.[7]
Outcrops edit
The Socotá Formation is apart from its type locality, found from Viotá in the south to Útica in the north.[1] The formation crops out on both sides of the Bogotá River in Anapoima and Apulo.[8][9][10]
Regional correlations edit
See also edit
References edit
Bibliography edit
- Acosta Garay, Jorge E., and Carlos E. Ulloa Melo. 2002. Mapa Geológico del Departamento de Cundinamarca - 1:250,000 - Memoria explicativa, 1–108. INGEOMINAS. Accessed 2017-06-05.
- Acosta Garay, Jorge, and Carlos E. Ulloa Melo. 2001. Geología de la Plancha 208 Villeta - 1:100,000, 1-84. INGEOMINAS. Accessed 2017-06-05.
- Villamil, Tomas. 2012. Chronology Relative Sea Level History and a New Sequence Stratigraphic Model for Basinal Cretaceous Facies of Colombia, 161–216. Society for Sedimentary Geology (SEPM).
Maps edit
- Ulloa, Carlos E; Erasmo Rodríguez, and Jorge E. Acosta. 1998. Plancha 227 - La Mesa - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
- Acosta, Jorge E., and Carlos E. Ulloa. 1998. Plancha 246 - Fusagasugá - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
- García Rivas, Mayen Paola. 2016. Análisis de la vulnerabilidad del recurso hídrico subterráneo por la demanda de los balnearios en el turismo de bienestar, municipios Anapoima y Apulo (Cundinamarca), 1. Universidad Distrital Francisco José de Caldas. Accessed 2017-06-05.
External links edit
- Gómez, J.; N.E. Montes; Á. Nivia, and H. Diederix. 2015. Plancha 5-09 del Atlas Geológico de Colombia 2015 – escala 1:500,000, 1. Servicio Geológico Colombiano. Accessed 2017-06-05.