Rhyolite and icelandite

Rhyolite and icelandite. Includes the Cross River, Palisade Head (~1,096 Ma), Devil Track, Maple Hill, Grand Marais, and Kimball Creek lavas.
State Minnesota
Name Rhyolite and icelandite
Geologic age Mesoproterozoic
Lithologic constituents
Major
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Flow)
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)icelandite
Comments Part of the North Shore Volcanic Group - upper sequence, normal 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