- Usage in publication:
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- Six Lakes Limestone Member
- Modifications:
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- Named
- Dominant lithology:
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- Limestone
- AAPG geologic province:
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- Michigan basin
Summary:
The informal cream limestone of Tyler (1980) is here named the Six Lakes Limestone Member in the lower part of the Hemlock Lake Formation of the Saginaw Group in the subsurface of the Michigan basin. It consists of white to yellowish-gray to light-brown micritic limestone with crystals of metallic sulfides. Anhydrite and gypsum were found by Tyler (1980). The member is widespread in the western part of the Hemlock Lake study area and ranges from 0 to 30 ft thick. Age is Early Pennsylvanian (Morrowan).
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 ([ ]).