North Dakota  search
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NTAdams County North Dakota
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RTBeaverhill Lake Group
 Amsden Formation
 Bakken Formation
 Colorado Group
 Bighorn Dolomite
 Birdbear Formation
 Bullion Creek Formation
 Fort Union Formation
 Cedar Creek Anticline
 Charles Formation
 Dakota Formation
 Devils Lake
 Duperow Formation
 Elk Point Group