Regadera Formation
Geological formation of the Colombian Andes
The Regadera Formation (Spanish: Formación Regadera, E2r, Tpr) is a geological formation of the Bogotá savanna, Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The predominantly sandstone and conglomeratic formation, with pink shale beds intercalated, dates to the Paleogene period; Middle to Late Eocene epoch, and has a maximum thickness of 765 metres (2,510 ft).
01Etymology
The formation was first described by Hubach in 1931 as part of the Usme Formation and redefined and named in 1963 by Julivert after the La Regadera Reservoir.
02Description
Lithologies
The Regadera Formation consists mainly of quartz arenitic sandstone and conglomerates with some shale beds.
Stratigraphy and depositional environment
The Regadera Formation overlies the Bogotá Formation and is overlain by the Usme and Tilatá Formations. The age has been estimated, based on palynological data of Echitriporites trianguliformis var. orbicularis, Nothofagidites sp. and Multiporopollenites pauciporatus, to be Middle to Late Eocene. The depositional environment has been interpreted as a braided river setting.
03Outcrops
The Regadera Formation is apart from its type locality in the synclinal of Usme, the valley of the Tunjuelo River, found in the synclinal of Sisga. In the Tunjuelo River valley, the Regadera Formations is present in the escarpments on the river banks.
04Regional correlations
- Legend
- group
- important formation
- fossiliferous formation
- minor formation
- (age in Ma)
- proximal Llanos (Medina)
- distal Llanos (Saltarin 1A well)
Sources and credits
This article is adapted from the Wikipedia article “Regadera Formation”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- Blakey 050Ma - COL.jpg by Xibalba, CC BY-SA 3.0
- Blakey 000Ma - COL.jpg by Xibalba, CC BY-SA 3.0
- Blakey Pleist - COL.jpg by Xibalba, CC BY-SA 3.0
- Blakey 020Ma - COL.jpg by Xibalba, CC BY-SA 3.0
- Blakey 035Ma - COL.jpg by Xibalba, CC BY-SA 3.0
- Blakey 065Ma - COL.jpg by Xibalba, CC BY-SA 3.0
- Blakey 090Ma - COL.jpg by Xibalba, CC BY-SA 3.0
- Blakey 105Ma - COL.jpg by Xibalba, CC BY-SA 3.0
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