Английская Википедия:Guavio Formation

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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]

Шаблон:Clear left

Regional correlations

Шаблон:Cretaceous stratigraphy of the central Colombian Eastern Ranges

See also

Шаблон:Portal

Шаблон:Icon Geology of the Eastern Hills
Шаблон:Icon Geology of the Ocetá Páramo
Шаблон:Icon Geology of the Altiplano Cundiboyacense

References

Шаблон:Reflist

Bibliography

Maps

External links

Шаблон:Colombian emeralds

  1. 1,0 1,1 1,2 1,3 Acosta & Ulloa, 2002, p.51