Ogallala Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Neogene
 ....Ogallala Formation
RTPliocene
 Miocene
 New Mexico
 Wyoming
 Oklahoma
 Colorado
 Nebraska
 Texas
 Kansas
 Ash Hollow Formation
 Ogallala Aquifer
 Valentine Formation
SNIncludes Burge Sands, Valentine Beds, Ash Hollow Member, Kimball Member. NE Colorado, W and central Kansas, W Nebraska, E New Mexico, W Oklahoma, NW Texas and SE Wyoming. As of 1989, use Ogallala Aquifer for hydrogeological discussions.