- Usage in publication:
-
- Four Mile Dam formation*
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Limestone
- AAPG geologic province:
-
- Michigan basin
Summary:
Pg. 260. Four Mile Dam formation. Fossiliferous limestone, which at its type section is a part of a reef of uncertain thickness overlain unconformably by Norway Point formation. Age is Middle Devonian.
Type section: at Four Mile Dam on Thunder Bay River, Alpena Co., northeastern MI.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1408).
- Usage in publication:
-
- Four Mile Dam formation*
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Michigan basin
Summary:
Pg. 579 (fig. 3), 587-589. Four Mile Dam formation. Overlies Alpena limestone. Includes Dock Street clay member at base. Thickness at type section 8 feet; thickness where Dock Street clay member is present about 16 feet. Included in Traverse group.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1408).
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 ([ ]).