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Undifferentiated Jurassic Sediments

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Dark-gray, greenish, and varicolored shale with local limestone (Swift and Rierdon Formation equivalents); mainly nearshore marine sediments; as thick as 180 metres (600 feet).
State North Dakota
Name Undifferentiated Jurassic Sediments
Geologic age Jurassic
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)mainly nearshore marine sediments
Minor
Sedimentary > Carbonate > Limestone (Bed)local limestone; mainly nearshore marine sediments
Stratigraphic units Swift and Rierdon Formation equivalents
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 Pembina - Walsh