Undifferentiated volcanic rocks and volcanic hornfels

Undifferentiated volcanic rocks and volcanic hornfels.
State Minnesota
Name Undifferentiated volcanic rocks and volcanic hornfels
Geologic age Mesoproterozoic
Lithologic constituents
Major
Igneous > Volcanic (Flow)Undifferentiated volcanic rocks and volcanic hornfels
Comments Part of the North Shore Volcanic Group - lower sequence, reversed and unknown polarity. Part of the Keweenawan Supergroup and Midcontinent Rift Intrusive Supersuite.
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 - Lake - Saint Louis