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El Peñón Formation

Geologic formation in Colombia From Wikipedia, the free encyclopedia

El Peñón Formation
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The El Peñón Formation (Spanish: Formación El Peñón, Kipe) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists of calcareous shales and siltstones and dates to the Early Cretaceous period; Late Aptian epoch and has a measured thickness at its type section of 381 metres (1,250 ft). Ammonite fossils have been found in the formation, deposited in a shallow marine platform environment.

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Etymology

The formation was defined and named in 1982 by Ulloa after El Peñón, Cundinamarca.[1]

Description

Lithologies

The El Peñón Formation has at is type section a thickness of 381 metres (1,250 ft),[2] and is characterised by a sequence of calcareous shales and siltstones. The middle part of the sequence contains gypsum.[3] Fossils of the ammonites Cheloniceras sp. and Epicheloniceras sp. aff. carlosacostai have been found in the El Peñón Formation.[1]

Stratigraphy and depositional environment

The El Peñón Formation, part of the Villeta Group, conformably overlies the Trincheras Formation and is conformably overlain by the Capotes Formation.[4] The age has been estimated to be Late Aptian.[1] Stratigraphically, the formation is time equivalent with the Tablazo Formation and a lateral facies equivalent of the Socotá Formation.[5] The formation has been deposited in a shallow marine platform environment.[1] In the Late Aptian, central Colombia was dominated by shallow marine carbonate platform environments.[6]

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Outcrops

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El Peñón Formation
Type locality of the El Peñón Formation to the west of the Altiplano Cundiboyacense

The El Peñón Formation, restricted to Cundinamarca, is locally found around its type locality,[1] between Bituima and Guayabal de Síquima,[7] and along the road from Villeta to Sasaima.[2]

See also

Geology of the Eastern Hills
Geology of the Ocetá Páramo
Geology of the Altiplano Cundiboyacense

References

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