Stratigraphy of the Lower Pierre Shale (Campanian): Implications for the Tectonic and Eustatic Controls on Facies Distributions
Figure 6
Thrusting activity in western Wyoming and Utah resulted in a broad foreland basin in the Western Interior. Cratonward of the foreland basin, a forebulge developed due to the stresses in the basin. (a) Cross-section of the Cretaceous Western Interior Seaway. (b) Map of the Cretaceous Western Interior Seaway in the northern United States showing the position of active faults in the Idaho-Wyoming thrust belt. 1 = Paris Fault, 2 = Meade-Crawford Fault, 3 = Absoroka Fault, 4 = Darby Fault, 5 = Hogsback Fault.
