Usage:
No current usage.
(†Fortymile series [informal] (AK) or †Fortymile Group (AK) replaced in part with Precambiran(?) age †Birch Creek Schist [later abandoned], and in part with Paleozoic age strata.)
Geologic age:
Precambrian
Paleozoic
Type section, locality, area and/or origin of name:
Not synopsized to date. Named from Fortymile Creek, tributary of Yukon River, east-central AK (Spurr, 1898).
AAPG geologic province:
Alaska East-Central 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 ([ ]).