Английская Википедия:Guadalupe Group

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Шаблон:Infobox rockunit The Guadalupe Group (Шаблон:Lang-es, K2G, Ksg) is a geological group of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The group, a sequence of shales and sandstones, is subdivided into three formations; Arenisca Dura, Plaeners and Arenisca Labor-Tierna, and dates to the Late Cretaceous period; Campanian-Maastrichtian epochs and at its type section has a thickness of Шаблон:Convert.

Etymology

The group was published in 1978 by Pérez and Salazar and named after its type locality Guadalupe Hill in the Eastern Hills of Bogotá.[1]

Description

Lithologies

The Guadalupe Group is characterised by three formations; two sandstone sequences, Arenisca Dura and Arenisca Labor-Tierna, and an intermediate shale formation; Plaeners.[1]

Stratigraphy and depositional environment

The Guadalupe Group overlies the Conejo Formation in the central part of the Altiplano Cundiboyacense and the Chipaque Formation in the eastern part and is overlain by the Guaduas Formation. Some authors define the Guadalupe Group as a formation and call the individual formations members.[2] The thickness of the Guadalupe Group in its type locality Guadalupe Hill and the El Cable Hill is Шаблон:Convert.[3] The age has been estimated to be Campanian-Maastrichtian.[4] The Guadalupe Group has been deposited in a marine environment.[5]

Outcrops

Шаблон:Location map The formations of the Guadalupe Group are apart from its type locality at Guadalupe Hill, Bogotá, found in other parts of the Eastern Hills of Bogotá, the Ocetá Páramo and many other locations, such as the Piedras del Tunjo in the Eastern Ranges.[4][6]

At present, the Guadalupe Group in the anticlinals of Zipaquirá and Nemocón contains rock salt. These halite deposits are not originally deposited in the Late Cretaceous Guadalupe Group, yet are allochthonous diapirs formed when the Jurassic-Lower Cretaceous normal faults were reactivated as reverse faults during the mayor Miocene tectonic movements of the Eastern Ranges.[7] The salt had been deposited during the Early Cretaceous (Valanginian-Barremian, approximately 135 to 125 Ma),[8] intruding into the overlying formations of the Upper Cretaceous.[9]

Шаблон:Clearboth

Regional correlations

Шаблон:Cretaceous stratigraphy of the central Colombian Eastern Ranges Шаблон:Stratigraphy of the Llanos Basin

Panorama

Шаблон:Wide image

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

Notes

Шаблон:Reflist

References

Шаблон:Reflist

Bibliography

Maps

External links

Шаблон:Commons category

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  1. ↑ 1,0 1,1 Montoya Arenas & Reyes Torres, 2005, p.37
  2. ↑ Guerrero Uscátegui, 1992, p.4
  3. ↑ Guerrero Uscátegui, 1992, p.5
  4. ↑ 4,0 4,1 Montoya Arenas & Reyes Torres, 2005, pp.38-50
  5. ↑ Villamil, 2012, p.164
  6. ↑ Plancha 227, 1998
  7. ↑ Montoya Arenas & Reyes Torres, 2005, p.98
  8. ↑ Guerrero Uscátegui, 1993, p.12
  9. ↑ García & Jiménez, 2016, p.24
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