Plainview Formation | |
---|---|
Stratigraphic range: Albian ~ | |
Type | Geological formation |
Unit of | Dakota Group |
Underlies | Glencairn Formation |
Overlies | Lytle Formation |
Lithology | |
Primary | Sandstone |
Other | Shale, siltstone |
Location | |
Coordinates | 38°24′N 105°18′W / 38.4°N 105.3°W |
Approximate paleocoordinates | 37°24′N 61°42′W / 37.4°N 61.7°W |
Region | Colorado |
Country | United States |
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]