Sabana Formation
| Sabana Formation Stratigraphic range: ~1.2–0.01 Ma | |
|---|---|
| Type | Geological formation |
| Underlies | Holocene unconsolidated sediments |
| Overlies | Subachoque Fm., Tilatá Fm. |
| Area | ~4,500 km2 (1,700 sq mi) |
| Thickness | up to 320 m (1,050 ft) |
| Lithology | |
| Primary | Shale |
| Other | Lignite, sandstone, volcanic ash |
| Location | |
| Coordinates | 4°43′02.3″N 74°13′01.2″W / 4.717306°N 74.217000°WCoordinates: 4°43′02.3″N 74°13′01.2″W / 4.717306°N 74.217000°W |
| Region |
Bogotá savanna, Altiplano Cundiboyacense Eastern Ranges, Andes |
| Country |
 Colombia
|
| Extent | ~90 km × 40 km (56 mi × 25 mi) |
| Type section | |
| Named for | Bogotá savanna |
| Named by | Helmens & Hammen |
| Location | Funza II well |
| Year defined | 1995 |
| Coordinates | 4°43′02.3″N 74°13′01.2″W / 4.717306°N 74.217000°W |
| Region | Cundinamarca |
| Country |
Colombia
|
| Thickness at type section | 317 m (1,040 ft) |
 Paleogeography of the Pleistocene by Ron Blakey | |
The Sabana Formation (Spanish: Formación Sabana, Q1sa, QTs) is a geological formation of the Bogotá savanna, Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists mainly of shales with at the edges of the Bogotá savanna lignites and sandstones. The Sabana Formation dates to the Quaternary period; epoch, and has a maximum thickness of 320 metres (1,050 ft), varying greatly across the savanna. It is the uppermost formation of the lacustrine and fluvio-glacial sediments of paleolake Humboldt, that existed at the edge of the Eastern Hills until the latest Pleistocene.
The uppermost sediments of the Sabana Formation were deposited during the Last Glacial Maximum, a time when the first humans populated the Bogotá savanna. These hunter-gatherers used the bones of the still extant Pleistocene megafauna as Haplomastodon waringi, Cuvieronius hyodon and Equus amerhippus lasallei, of which fossils have been found in the Sabana Formation.
Knowledge about the formation has been provided by geologists Alberto Guerrero, Thomas van der Hammen and others.
The formation was first defined and named after the Bogotá savanna (Sabana de Bogotá) by Hubach in 1957, further described by Van der Hammen in 1973, Guerrero (1992, 1993, 1996) and by Helmens and Van der Hammen in 1995.
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