Undifferentiated

Conglomerate, sandstone, mudstone, shale, marlstone, siltstone, and minor lignite, deposited in marine and non-marine settings; likely Cenomanian to Campanian age. Unit outline is the product of contouring the stratigraphic top and base, from which an isopach grid was created. Because the distribution is patchy, unit boundaries were drawn from the gridded data to represent locations where more than 25 feet (8 meters) of thickness occurs. As a result, many areas outside of the unit boundaries may be overlain by thin Cretaceous strata and the unit is depicted without a contact line.
State Minnesota
Name Undifferentiated
Geologic age Cenomanian to Campanian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Minor
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Carbonate > Marlstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Incidental
Sedimentary > Coal > Lignite (Bed)
References

Jirsa, Mark A., Boerboom, Terrence J., Chandler, Val W., Mossler, John H., Runkel, Anthony C., and Setterholm, Dale R., 2011, S-21 Geologic Map of Minnesota-Bedrock Geology; Minnesota Geological Survey, State Map Series S-21. Scale 1:500,000.

NGMDB product
Counties Becker - Beltrami - Big Stone - Brown - Cass - Chippewa - Clay - Clearwater - Cottonwood - Crow Wing - Douglas - Grant - Jackson - Kandiyohi - Kittson - Lac qui Parle - Lincoln - Lyon - McLeod - Marshall - Martin - Meeker - Morrison - Murray - Nicollet - Nobles - Otter Tail - Pennington - Pipestone - Polk - Pope - Red Lake - Redwood - Renville - Rock - Roseau - Sherburne - Sibley - Stearns - Stevens - Swift - Traverse - Wadena - Watonwan - Wilkin - Wright - Yellow Medicine