Newcastle Sandstone  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Lower Cretaceous
 .....Newcastle Sandstone
RTWyoming
 Montana
 Nebraska
 North Dakota
 South Dakota
 Colorado Group
SNSE Montana, W Nebraska, NE North Dakota, W South Dakota and NE Wyoming. Added to Thesaurus in 1989.