Duchesne River Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Paleogene
 ....Duchesne River Formation
RTEocene
 Oligocene
 Utah
 Colorado
SNEocene or Oligocene. Unconformably underlies Bishop Conglomerate; unconformably overlies Uinta and Uinta (?) Formation. NW Colorado and NE Utah. Indexed with ages as applicable.