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Dacite and volcanogenic graywacke

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Includes andesite tuff. Occurs in northeastern Wisconsin. Dacite has age of 1866 +/- 39 Ma.
State Michigan
Name Dacite and volcanogenic graywacke
Geologic age Early Proterozoic
Lithologic constituents
Major
Igneous > Volcanic > Felsic-volcanic > Dacite (Flow)dacite, volcanogenic graywacke, andesite tuff
Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic-tuff)dacite, volcanogenic graywacke, andesite tuff
Sedimentary > Clastic > Sandstone > Graywacke (Tuffaceous)dacite, volcanogenic graywacke, andesite tuff
Comments Pembine-Wausau terrane. This unit also occurs as a thin sliver in northwestern Michigan, just south of the Niagara Fault.
References

Sims, P.K., 1992, Geologic map of Precambrian rocks, southern Lake Superior region, Wisconsin and northern Michigan: U.S. Geological Survey Miscellaneous Investigations Map I-2185, scale 1:500,000.

https://pubs.er.usgs.gov/publication/i2185
NGMDB product
Counties Menominee