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Oronto Group; Nonesuch Shale

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Gray, green, and brown lithic siltstone, shale, and sandstone. Copper sulfides and native copper occur locally near base
State Michigan
Name Oronto Group; Nonesuch Shale
Geologic age Middle Proterozoic
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone (Bed)Gray, green, and brown lithic siltstone, shale, and sandstone. Copper sulfides and native copper occur locally near base
Sedimentary > Clastic > Mudstone > Shale (Bed)Gray, green, and brown lithic siltstone, shale, and sandstone. Copper sulfides and native copper occur locally near base
Sedimentary > Clastic > Sandstone (Bed)Gray, green, and brown lithic siltstone, shale, and sandstone. Copper sulfides and native copper occur locally near base
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 Gogebic - Houghton - Keweenaw - Ontonagon