Mancos Shale  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Mancos Shale
RTNew Mexico
 Utah
 Wyoming
 Colorado
 Arizona
 Frontier Formation
 Ferron Sandstone Member
 Tununk Member
SNLower and Upper Cretaceous. In Colorado, it is restricted to thick succession of shale, sandy shale, and thin-bedded sandstone overlying Niobrara Formation and underlying Mesaverde Group. NE Arizona, W Colorado, NW New Mexico, E Utah, and S and central Wy