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Oronto Group; Freda Sandstone

Oronto Group; Freda Sandstone - Mainly reddish-brown, medium- to fine-grained lithic arkosic sandstone, siltstone, and micaceous silty shale.
StateMichigan
NameOronto Group; Freda Sandstone
Geologic ageMiddle Proterozoic
Original map labelYf
Primary rock typearkose
Secondary rock typesiltstone
Other rock typesshale
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone > Arkose (Bed)
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
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
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
Geographic coverageGogebic - Houghton - Keweenaw - Ontonagon

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