Tunjuelo Formation
| Tunjuelo Formation | |
|---|---|
| Stratigraphic range: Pleistocene ~ | |
| Type | Geological formation |
| Underlies | Chía Fm., Sabana Fm. |
| Overlies | Marichuela Formation Subachoque Formation |
| Thickness | up to 150 metres (490 ft) |
| Lithology | |
| Primary | Conglomerate |
| Other | Sandstone, shale |
| Location | |
| Coordinates | 4°28′04.0″N 74°08′11.9″W / 4.467778°N 74.136639°W |
| Region | Bogotá savanna, Altiplano Cundiboyacense Eastern Ranges, Andes |
| Country | Colombia |
| Type section | |
| Named for | Tunjuelo River |
| Named by | Helmens & Hammen |
| Location | Tunjuelo River valley |
| Year defined | 1995 |
| Coordinates | 4°28′04.0″N 74°08′11.9″W / 4.467778°N 74.136639°W |
| Region | Cundinamarca |
| Country | Colombia |
Paleogeography of the Pleistocene by Ron Blakey | |
The Tunjuelo Formation, Río Tunjuelo or Río Tunjuelito Formation (Spanish: Formación Tunjuelo, Q1tu, Qpt, Qcc) is a geological formation of the Bogotá savanna, Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists mainly of conglomerates with intercalating shales and sandstones. The Tunjuelo Formation dates to the Quaternary period; covering the complete Pleistocene epoch, and has a maximum thickness of 150 metres (490 ft). It is a formation of the lacustrine and fluvio-glacial sediments of Lake Humboldt.