- Usage in publication:
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- Kirby Lake Member
- Modifications:
-
- Named
- Dominant lithology:
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- Till
- AAPG geologic province:
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- Wisconsin arch
Summary:
Following the informal usage of McCartney (1979), the Kirby Lake Member of the Kewaunee Formation is here named on the west side of the Green Bay Lobe in WI. It consists of reddish-brown to yellowish-red sand-silt-clay till. Unconformably overlies pre-Pleistocene rocks or Silver Cliff Member of the Kewaunee; unconformably underlies the Middle Inlet Member of the Kewaunee or is the surface unit. The contact with the equivalent Chilton Member of the Kewaunee Formation on the east side of the Green Bay Lobe is an arbitrary vertical contact at the Fox River. Thickness varies from 1 m at the surface to 10 m in the subsurface. Age is Pleistocene (late Wisconsinan).
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 ([ ]).