| Pacho Formation | |
| Period: | Cenomanian |
| Age: | Late Albian-Cenomanian ~ |
| Type: | Geological formation |
| Prilithology: | Siltstone |
| Otherlithology: | Shale |
| Unitof: | Villeta Group |
| Underlies: | Simijaca Formation |
| Overlies: | Hiló Formation |
| Thickness: | ~1050m (3,450feet) |
| Map: | Blakey 105Ma - COL.jpg |
| Coordinates: | 4.4519°N -74.0556°W |
| Region: | Altiplano Cundiboyacense Eastern Ranges, Andes |
| Namedfor: | Pacho |
| Namedby: | Ulloa |
| Year Ts: | 1982 |
| Location Ts: | Pacho |
| Coordinates Ts: | 4.4519°N -74.0556°W |
| Region Ts: | Cundinamarca |
The Pacho Formation (Spanish; Castilian: Limolitas de Pacho, Kslp) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consisting of alternating siltstones and shales with siderite concretions dates to the Middle Cretaceous period; Late Albian to Cenomanian epochs and has an approximate thickness of 1050m (3,450feet).
The formation was defined and named in 1982 by Ulloa after Pacho, Cundinamarca.
The Pacho Formation has an approximate thickness of 1050m (3,450feet), and is characterised by a sequence of alternating siltstones and shales with siderite concretions.[1]
The Pacho Formation, pertaining to the Villeta Group, partly overlies and is partly lateral equivalent with the Hiló Formation and is partly overlain by and partly time equivalent with the Simijaca Formation. The age has been estimated to be Late Albian to Cenomanian. Stratigraphically, the formation is time equivalent with the Une Formation. The formation has been deposited in an outer marine platform environment.[1]
The Pacho Formation is found around its type locality near Pacho.[1]
Geology of the Eastern Hills
Geology of the Ocetá Páramo
Geology of the Altiplano Cundiboyacense