Oronto Group; Freda Sandstone

Mainly reddish-brown, medium- to fine-grained lithic arkosic sandstone, siltstone, and micaceous silty shale.
State Wisconsin
Name Oronto Group; Freda Sandstone
Geologic age Middle Proterozoic
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Sandstone > Arkose (Bed)
Minor
Sedimentary > Clastic > Mudstone > Shale (Bed)
References
NGMDB product
Counties Ashland - Bayfield - Douglas - Iron