Usage:
Fortune Lakes Slate of Paint River Group of Marquette Range Supergroup (recognized locally in MI*,WI)
Notable exposures in Iron River-Crystal Falls district, Northern Peninsula.
Geologic age:
Paleoproterozoic*
Type section, locality, area and/or origin of name:
Not designated. Main areas of exposure are between Crystal Falls and Fortune Lakes, and between Alpha and Brule River, Iron Co., Northern Peninsula, northwestern MI. Named from Fortune Lakes (James, 1958).
AAPG geologic province:
Lake Superior region*
Wisconsin arch*
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 ([ ]).