Greenhorn Formation

Dark-gray calcareous shale; marine offshore sediment; as thick as 45 metres (150 feet).
State North Dakota
Name Greenhorn Formation
Geologic age Upper Cretaceous
Lithologic constituents
Sedimentary > Clastic > Mudstone > Shale (Bed, Calcareous)marine offshore sediment

North Dakota Geological Survey, 2001, Geologic Bedrock Map of North Dakota based on Bluemle, John P., 1983, Geologic and Topographic Bedrock Map of North Dakota, NDGS Miscellaneous Map 25, 1:670,000 scale.

NGMDB product
Counties Cass - Cavalier - Grand Forks - Pembina - Ransom - Richland - Sargent - Steele - Traill - Walsh