Villeta Group
Geological group in central Colombia / From Wikipedia, the free encyclopedia
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The Villeta Group (Spanish: Grupo Villeta) is a geological group of the Eastern Ranges of the Colombian Andes, to the west of the Altiplano Cundiboyacense. The group, a sequence of shales, limestones and sandstones, is subdivided into various formations; Conejo, La Frontera, Simijaca, Hiló, Pacho, Chiquinquirá, Capotes, Socotá, El Peñón, and Trincheras, and dates to the Cretaceous period; Aptian-Coniacian epochs. The group stretches out across four departments, from Huila in the south, through Cundinamarca and Boyacá to southern Santander in the north. The upper part of the Villeta Group is time-equivalent with the La Luna Formation of the Middle Magdalena Valley (VMM) and Sierra Nevada del Cocuy, the Oliní and Güagüaquí Groups of the Guaduas-Vélez synclinal and the Chipaque Formation of the Altiplano Cundiboyacense. The lower part has been correlated with the Simití, Tablazo and Paja Formations of the VMM, the upper Tibasosa, Une and Fómeque Formations of the Altiplano Cundiboyacense and the Capacho, Aguardiente, Tibú-Mercedes and upper Río Negro Formations of the Sierra Nevada del Cocuy.
Villeta Group | |
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Stratigraphic range: Aptian-Coniacian ~125–87 Ma | |
Type | Geological group |
Sub-units | Conejo Fm., La Frontera Fm., Simijaca Fm., Hiló Fm., Pacho Fm., Chiquinquirá Sst., Capotes Fm., Socotá Fm., El Peñón Fm., Trincheras Fm. |
Underlies | Guadalupe Group |
Overlies | La Naveta Formation |
Lithology | |
Primary | Sandstone, shale, limestone |
Location | |
Coordinates | 5°00′59″N 74°28′54″W |
Region | Altiplano Cundiboyacense Eastern Ranges, Andes |
Country | Colombia |
Type section | |
Named for | Villeta |
Named by | Humboldt |
Year defined | 1810 |
Coordinates | 4°35′31″N 74°03′15″W |
Region | Cundinamarca, Boyacá, Huila, Santander |
Country | Colombia |
Paleogeography of northern South America 105 Ma, by Ron Blakey |