Plainview 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]

Plainview Formation
Stratigraphic range: Albian ~112–100 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Dakota Group
Underlies	Glencairn Formation
Overlies	Lytle Formation
Lithology
Primary	Sandstone
Other	Shale, siltstone
Location
Coordinates	38.4°N 105.3°W / 38.4; -105.3
Approximate paleocoordinates	37.4°N 61.7°W / 37.4; -61.7
Region	Colorado
Country	United States
Plainview Formation (the United States) Show map of the United States Plainview Formation (Colorado) Show map of Colorado

Description

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]

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with ornithischian tracks
    • Ankylosaur tracks