Penokean intrusion

Mille Lacs granite (~2,009 Ma).
State Minnesota
Name Penokean intrusion
Geologic age Paleoproterozoic
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Granite (Stock or pipe)
Comments Twice-deformed metasedimentary rocks at the apparent base of the Animikie basin. Part of the Geon 18 intrusions and supracrustal rocks (syn- to late Penokean orogenesis).
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 Aitkin - Crow Wing