| Plainview Formation | |
| Type: | Geological formation |
| Age: | Albian ~ |
| Period: | Albian |
| Prilithology: | Sandstone |
| Otherlithology: | Shale, siltstone |
| Region: | Colorado |
| Coordinates: | 38.4°N -105.3°W |
| Paleocoordinates: | 37.4°N -61.7°W |
| Unitof: | Dakota Group |
| Underlies: | Glencairn Formation |
| Overlies: | Lytle Formation |
The Plainview Formation is an Early Cretaceous (Albian) geologic formation of the Dakota Group in Colorado.[1] Fossil ankylosaur tracks and tracks of Caririchnium sp. have been reported from the formation.[2]
The formation overlies the Lytle Formation and is overlain by the Glencairn Formation and comprises resistant, brown-weathered sandstones, and dark shales and siilstones, also described as bioturbated brownish sandstones with black and grey silty or shaley sandstone intervals. The formation was deposited in a variety of near-shore and/or marginal marine environments. The tracks occur in the upper part of an estuarine point bar sequence, overlain by brackish bay or lagoon deposits.[1]