State | Michigan |
---|---|
Name | Oronto Group; Freda Sandstone |
Geologic age | Middle Proterozoic |
Lithologic constituents | Major
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Sandstone > Arkose (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
|
References | |
NGMDB product | |
Counties | Gogebic - Houghton - Keweenaw - Ontonagon |