Английская Википедия:Guavio Formation
Шаблон:Infobox rockunit The Guavio Formation (Шаблон:Lang-es, Kicg) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists of conglomerates, shales and limestones, dates to the Late Jurassic and Early Cretaceous periods; Tithonian to Berriasian epochs and has a maximum thickness of Шаблон:Convert.
Etymology
The formation was defined and named in 1976 by Rodríguez and Ulloa after the Guavio River, Cundinamarca.[1]
Description
Lithologies
The Guavio Formation has a maximum thickness of Шаблон:Convert, and is characterised by a sequence of conglomerates, shales and limestones.[1]
Stratigraphy and depositional environment
The Guavio Formation, the lowermost unit of the Cáqueza Group, overlies the Batá Formation and is overlain by the Macanal Formation. The unit is subdivided into five members, from old to younger; Conglomerado de Miralindo, Lutitas de Miralindo, Caliza de Malacara, Lutitas de Las Mercedes and Caliza de Las Mercedes. The age has been estimated to be Tithonian to Berriasian, spanning the Jurassic-Cretaceous boundary. Stratigraphically, the formation is time equivalent with the Arcabuco Formation. The formation has been deposited in a shallow marine environment in an oxygen-poor basin.[1]
Outcrops
Шаблон:Location map The Guavio Formation is apart from its type locality at the Alto de Miralindo and Cuchilla de Manizales, found near Gachalá and Medina.[1]
Regional correlations
Шаблон:Cretaceous stratigraphy of the central Colombian Eastern Ranges
See also
- Шаблон:Icon Geology of the Eastern Hills
- Шаблон:Icon Geology of the Ocetá Páramo
- Шаблон:Icon Geology of the Altiplano Cundiboyacense
References
Bibliography
Maps
- Шаблон:Cite LSA
- Шаблон:Cite LSA
- Шаблон:Cite LSA
- Шаблон:Cite LSA
- Шаблон:Cite LSA
- Шаблон:Cite LSA
- Шаблон:Cite LSA
External links
- Английская Википедия
- Geologic formations of Colombia
- Jurassic Colombia
- Cretaceous Colombia
- Jurassic System of South America
- Lower Cretaceous Series of South America
- Tithonian Stage
- Berriasian Stage
- Conglomerates (geology)
- Limestone formations
- Shale formations
- Shallow marine deposits
- Colombian emeralds
- Altiplano Cundiboyacense
- Geography of Cundinamarca Department
- Geography of Boyacá Department
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