- Usage in publication:
-
- Alpena limestone
- Modifications:
-
- Named
- Dominant lithology:
-
- Limestone
- AAPG geologic province:
-
- Michigan basin
Summary:
Alpena limestone (new name) in northeastern Michigan is 25 to 34 ft thick. Underlies Thunder Bay series (Traverse upper shales) and overlies Traverse lower shales and limestones. All included in Traverse group.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Alpena limestone
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Michigan basin
Summary:
Alpena limestone restricted to exclude "black Alpena" zone which is separated below as Killians limestone (new). Dock Street clay of Grabau (1902) is considered local clay facies of upper Alpena horizon. Underlies Norway Point formation (new). Included in Traverse group.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Alpena limestone
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Michigan basin
Summary:
Alpena limestone further restricted. Lower 15 feet, which contains a Genshaw fauna, placed in that formation. Next division, which consists of 25 feet of yellowish to brown crystalline limestone, to which the name Alpena is restricted, consists of 79 feet of light-gray to white limestone. Above Alpena (restricted) occur 8 feet of blue clay shale, Dock Street clay of Grabau (1902), a lens confined to east side of Alpena, and classified with Alpena limestone. Overlying Dock Street and Alpena is Four Mile Dam limestone.
Source: GNU records (USGS DDS-6; Reston 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 ([ ]).