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- Usage in publication:
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- Lake George Formation
- Modifications:
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- Named
- Dominant lithology:
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- Sandstone
- Claystone
- AAPG geologic province:
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- Michigan basin
Summary:
The Lake George Formation of the Saginaw Group is here named in the subsurface of the Michigan basin. It consists of white, yellowish-gray, to grayish-red fine- to coarse-grained, friable, quartz sandstone and grayish-brown massive claystone, with local shale and siltstone. Overlies the Hemlock Lake Formation; gradationally underlies the Winn Formation. The deposits represent channel fill sediments. Thickness at type section is 121 ft. 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 ([ ]).