Volcanogenic graywacke and mudstone

Volcanogenic graywacke and mudstone. Includes the Lake Vermilion Formation.
State Minnesota
Name Volcanogenic graywacke and mudstone
Geologic age Neoarchean
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone > Graywacke (Bed)Volcanogenic graywacke
Sedimentary > Clastic > Mudstone (Bed)Volcanogenic mudstone
Comments Part of the Supracrustal and hypabyssal intrusive rocks of the Wawa and Wabigoon subprovinces. Pre-D1 metavolcanic, metasedimentary, and hypabyssal intrusive rocks.
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 Cass - Hubbard - Itasca - Otter Tail - Saint Louis