| Subachoque Formation | |
|---|---|
| Stratigraphic range: Early to Mid Pleistocene ~ | |
| Type | Geological formation |
| Underlies | Sabana Formation |
| Overlies | Tilatá Formation Guadalupe Gp. Guaduas Fm., Cacho Fm., Bogotá Fm., Regadera Fm. |
| Thickness | up to 150 metres (490 ft) |
| Lithology | |
| Primary | Shale, lignite |
| Other | Sandstone |
| Location | |
| Coordinates | 4°57′17.3″N 74°13′07.5″W / 4.954806°N 74.218750°W |
| Region | Bogotá savanna, Altiplano Cundiboyacense Eastern Ranges, Andes |
| Country |  Colombia |
| Type section | |
| Named for | Subachoque |
| Named by | Helmens & Hammen |
| Location | Subachoque Synclinal |
| Year defined | 1995 |
| Coordinates | 4°57′17.3″N 74°13′07.5″W / 4.954806°N 74.218750°W |
| Region | Cundinamarca |
| Country | Colombia |
 Paleogeography of the Pleistocene by Ron Blakey | |
The Subachoque Formation (Spanish: Formación Subachoque, Q1su) is a geological formation of the Bogotá savanna, Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists mainly of sandy shales and lignite with sandstone beds. The Subachoque Formation dates to the Quaternary period; Early to Middle Pleistocene epoch (from approximately 2.5 to 1 Ma), and has a maximum thickness of 150 metres (490 ft). It is the lowermost formation of the lacustrine and fluvio-glacial sediments of Lake Humboldt.