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Graneros Shale  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Graneros Shale
RTNew Mexico
 Wyoming
 Montana
 Colorado
 Nebraska
 Kansas
 South Dakota
 Belle Fourche Shale
 Colorado Group
 Benton Formation
SNIn Colorado Group. E Colorado, Kansas, SE Montana, Nebraska, NE New Mexico, South Dakota, and E Wyoming.