Copper Harbor Conglomerate (MIYc;0)

State	Michigan
Name	Copper Harbor Conglomerate
Geologic age	Middle Proterozoic
Original map label	Yc
Comments	Note: The unnamed formation has since been named the Porcupine Volcanics ("Ypv").
Primary rock type	conglomerate
Secondary rock type	sandstone
Other rock types	lava flow
Lithologic constituents	Major 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. 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. 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.
Map 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 [http://pubs.er.usgs.gov/publication/i2185]
Unit 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 [http://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), on-line only
Geographic coverage	Gogebic - Houghton - Keweenaw - Ontonagon