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Winnipeg Group

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Light-gray to greenish-gray shale and light-gray sandstone; marine nearshore and offshore sediment; as thick as 125 metres (400 feet).
State North Dakota
Name Winnipeg Group
Geologic age Ordovician
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)marine nearshore and offshore sediment
Sedimentary > Clastic > Mudstone > Shale (Bed)marine nearshore and 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 Grand Forks