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Mafic volcanic and hypabyssal intrusive rocks of uncertain age

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Mafic volcanic and hypabyssal intrusive rocks of uncertain age. Adjacent to and within the Yellow Medicine shear zone.
State Minnesota
Name Mafic volcanic and hypabyssal intrusive rocks of uncertain age
Geologic age Archean or Paleoproterozoic
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic
Igneous > Hypabyssal
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 Lincoln - Lyon - Renville - Yellow Medicine