Conglomerate, lithic sandstone, and graywacke, undifferentiated

Conglomerate, lithic sandstone, and graywacke, undifferentiated. Includes the Midway sequence, Seine Group, and a part of the Knife Lake Group known as the Ogishkemuncie conglomerate that contains clasts of ~2,690 Ma Saganaga Tonalite (unit Ast). Deposition of alluvial fan and fluvial sediments occurred in fault-bounded basins.
State Minnesota
Name Conglomerate, lithic sandstone, and graywacke, undifferentiated
Geologic age Neoarchean
Lithologic constituents
Major
Sedimentary > Clastic > Conglomerate (Bed)
Sedimentary > Clastic > Sandstone > Graywacke (Bed)
Sedimentary > Clastic > Sandstone (Bed)lithic sandstone
Comments Part of the Supracrustal and hypabyssal intrusive rocks of the Wawa and Wabigoon subprovinces. Post-D1/pre-D2 alkalic volcanic and successor-basin deposits.
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 Cook - Itasca - Koochiching - Lake - Saint Louis