Ash H  search
Ash Hollow Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Neogene
 ....Pliocene
 .....Ash Hollow Formation
RTWyoming
 Nebraska
 Kansas
 South Dakota
 Ogallala Formation
SNIn Ogallala Formation. W Kansas, W Nebraska, South Dakota, and SE Wyoming.