Usage:
Freda Sandstone of Oronto Group of Keweenawan Supergroup (MI*,WI*)
Freda Formation of Oronto Group of Keweenawan Supergroup (MI*,WI*)
Geologic age:
Mesoproterozoic*
Type section, locality, area and/or origin of name:
Exposures at new stamp mills at Freda, Houghton Co., and along adjacent shore, northwestern MI (Upper Peninsula) (Lane and Seaman, 1907).
AAPG geologic province:
Wisconsin arch*
Lake Superior region*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).