Guaduas Formation
| Guaduas Formation Stratigraphic range: Maastrichtian-Paleocene ~68–60 Ma |
|
|---|---|
| Type | Geological formation |
| Underlies | Cacho Formation |
| Overlies |
Guadalupe Gp. Arenisca Labor-Tierna Fm. |
| Thickness | up to 1,090 metres (3,580 ft) |
| Lithology | |
| Primary | Shale |
| Other | Sandstone, coal |
| Location | |
| Coordinates | 5°05′N 74°36′W / 5.083°N 74.600°WCoordinates: 5°05′N 74°36′W / 5.083°N 74.600°W |
| Region |
Middle Magdalena Basin Magdalena River Valley Altiplano Cundiboyacense Eastern Ranges, Andes |
| Country |
 Colombia
|
| Type section | |
| Named for | Guaduas |
| Named by | Hubach |
| Location | Guaduas |
| Year defined | 1931 |
| Coordinates | 5°05′N 74°36′W / 5.083°N 74.600°W |
| Approximate paleocoordinates | 0°36′N 52°30′W / 0.6°N 52.5°W |
| Region | Cundinamarca, Boyacá |
| Country |
Colombia
|
 Paleogeography of Northern South America 65 Ma, by Ron Blakey |
|
The Guaduas Formation (Spanish: Formación Guaduas, K2P1G, K2E1G, KPgg, KTg, TKg, Ktg) is a geological formation of the Middle Magdalena Basin and the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The predominantly shale with coalbed formation dates to the Late Cretaceous and Paleogene periods; Maastrichtian-Paleocene epochs, and has a maximum thickness of 1,090 metres (3,580 ft). Fossils of Coussapoa camargoi, Ficus andrewsi, Berhamniphyllum sp. and Archaeopaliurus boyacensis have been found in coalbeds in Zipaquirá and Tasco, Boyacá.
The formation was first described by Hettner in 1894 and named in 1931 by Hubach after Guaduas, Cundinamarca, former northern territory of the Panche.
The Guaduas Formation consists mainly of shales with intercalated sandstone beds. The formation contains coalbeds that are widely explored in the area. Fossil remains of Coussapoa camargoi, Ficus andrewsi, Berhamniphyllum sp. and Archaeopaliurus boyacensis have been found in coalbeds in Zipaquirá and Tasco, Boyacá.
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