Smoky Hill Chalk Member  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Upper Cretaceous
 .....Smoky Hill Chalk Member
RTNew Mexico
 Colorado
 Kansas
 South Dakota
 Niobrara Formation
SNOf Niobrara Formation. E Colorado, W Kansas, NE New Mexico, and SE South Dakota.