| Rosablanca Formation | |
|---|---|
| Stratigraphic range: Valanginian ~ | |
| Type | Geological formation |
| Underlies | Paja Fm., Ritoque Fm. |
| Overlies | Cumbres Fm., Girón Fm., Los Medios Fm. |
| Thickness | ~470 m (1,540 ft) |
| Lithology | |
| Primary | Sandstone |
| Other | Shale |
| Location | |
| Coordinates | 4°27′07″N 74°03′20″W / 4.45194°N 74.05556°W |
| Region | Altiplano Cundiboyacense Eastern Ranges, Andes |
| Country |  Colombia |
| Type section | |
| Named by | Wheeler |
| Location | Mesa de Los Santos |
| Year defined | 1929 |
| Coordinates | 4°27′07″N 74°03′20″W / 4.45194°N 74.05556°W |
| Region | Boyacá, Santander |
| Country | Colombia |
The Rosablanca Formation (Spanish: Formación Rosablanca, Kir) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes and the Middle Magdalena Basin. The formation consists of grey limestones, dolomites and shales with at the upper part sandstones. The formation dates to the Early Cretaceous period; Valanginian epoch and has a thickness of 425 metres (1,394 ft) in the valley of the Sogamoso River.