| Fómeque Formation | |
| Period: | Aptian |
| Age: | Barremian-Late Aptian ~ |
| Type: | Geological formation |
| Prilithology: | Organic shale |
| Otherlithology: | Limestone, sandstone |
| Unitof: | Villeta Group |
| Underlies: | Une Formation |
| Overlies: | Las Juntas Formation |
| Thickness: | up to 1200m (3,900feet) |
| Map: | Blakey 120Ma - COL.jpg |
| Coordinates: | 4.4519°N -74.0556°W |
| Region: | Altiplano Cundiboyacense Eastern Ranges, Andes |
| Namedfor: | Fómeque |
| Namedby: | Hubach |
| Year Ts: | 1957 |
| Location Ts: | Fómeque |
| Coordinates Ts: | 4.4519°N -74.0556°W |
| Region Ts: | Cundinamarca, Boyacá |
The Fómeque Formation (Spanish; Castilian: Formación Fómeque, Kif) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The predominantly organic shale formation dates to the Early Cretaceous period; Barremian to Late Aptian epochs and has a maximum thickness of 1200m (3,900feet).
The formation was defined and named in 1957 by Hubach after Fómeque, Cundinamarca.[1]
The Fómeque Formation has a maximum thickness of 1200m (3,900feet), and is characterised by a sequence of pyritic organic shales, with limestones and sandstone banks intercalated in the formation. The Fómeque Formation contains high values of TOC.[2] Fossils of Acarthohoplites sp., Melchionites sp., Nicklesia sp., Olcostephanus sp., Pulchellia sp. have been found in the formation.[3]
The Fómeque Formation overlies the Las Juntas Formation and is overlain by the Une Formation. The age has been estimated to be Barremian to Late Aptian. Stratigraphically, the formation is time equivalent with the Mercedes Formation. The formation has been deposited in a shallow marine environment.[2]
The Fómeque Formation is apart from its type locality, found in other parts of the Eastern Ranges.
Geology of the Eastern Hills
Geology of the Ocetá Páramo
Geology of the Altiplano Cundiboyacense