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Copper Harbor Conglomerate

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Red lithic conglomerate and sandstone; mafic to felsic volcanic flows similar to those of the unnamed formation (unit Yu) are interlayered with the sedimentary rocks.
State Michigan
Name Copper Harbor Conglomerate
Geologic age Middle Proterozoic
Lithologic constituents
Major
Sedimentary > Clastic > Conglomerate (Bed)Red lithic conglomerate and sandstone; mafic to felsic volcanic flows similar to those of the unnamed formation (unit Yu) are interlayered with the sedimentary rocks.
Sedimentary > Clastic > Sandstone (Bed)Red lithic conglomerate and sandstone; mafic to felsic volcanic flows similar to those of the unnamed formation (unit Yu) are interlayered with the sedimentary rocks.
Minor
Igneous > Volcanic > Mafic-volcanic (Flow)Red lithic conglomerate and sandstone; mafic to felsic volcanic flows similar to those of the unnamed formation (unit Yu) are interlayered with the sedimentary rocks.
Comments Note: The unnamed formation has since been named the Porcupine Volcanics (""Ypv"").
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

Cannon, W.F., Kress, T.H., Sutphin, D.M., Morey, G.B., Meints, Joyce, and Barber-Delach, Robert, 1997, Digital Geologic Map and mineral deposits of the Lake Superior Region, Minnesota, Wisconsin, Michigan: USGS Open-File Report 97-455 (version 3, Nov. 1999).

https://pubs.er.usgs.gov/publication/ofr97455
NGMDB product
Counties Gogebic - Houghton - Keweenaw - Ontonagon