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Niobrara Formation

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Light-brown to dark-gray calcareous shale; marine offshore sediment; as thick as 75 metres (250 feet).
State North Dakota
Name Niobrara Formation
Geologic age Upper Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed, Calcareous)marine offshore sediment
References

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 Barnes - Benson - Cavalier - Dickey - Grand Forks - Griggs - LaMoure - Nelson - Pembina - Ramsey - Ransom - Sargent - Steele - Walsh