- Usage in publication:
-
- Aitkin formation
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Slate
- Phyllite
- AAPG geologic province:
-
- Lake Superior region
Summary:
Pg. 101-106. The pre-Cambrian upper Huronian (Cuyuna series) of Cuyuna district is lithologically divided into 3 conformable formation (descending) Crow Wing formation, Aitkin formation, and basal conglomerate. The Aitkin formation consists of gray slates and phyllites. It contains some iron carbonate but extensive iron-bearing lenses are virtually lacking, and volcanics are absent. It is nonmagnetic. It underlies large area in northern and eastern parts of Aitkin County and extends into Crow Wing and Cass Counties, central Minnesota.
Source: US geologic names lexicon (USGS Bull. 896, p. 19-20).
- Usage in publication:
-
- Aitkin Formationâ€
- Modifications:
-
- Abandoned
Summary:
Abandoned for Animikie-age rocks in MN in the Lake Superior region.
Source: GNU records (USGS DDS-6; Denver GNULEX).
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 ([ ]).