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National Geologic Map Database

Geologic Unit: Quimbys Mill

Usage:

Quimbys Mill Member of Platteville Formation (IL*,IA*,WI*)
Quimbys Mill Formation of Sinnepee Group (WI)
Quimbys Mill Formation of Platteville Group (IL)
Quimbys Mill Member of Platteville Formation of Galena Group (IA)


Subunits:

FORMATION STATUS (alphabetical) --all in IL: Deicke K-bentonite Bed, Hazel Green Member, Shullsburg Member, Strawbridge Member.
MEMBER STATUS (alphabetical) --all in WI: Hazel Green Bed, Strawbridge Bed.


Geologic age:

Late Ordovician (Mohawkian; Turinian)*


Type section, locality, area and/or origin of name:

Type section: small quarry at Quimby's Mill, near Etna, in SE/4 SE/4 sec. 11, T. 1 N., R. 1 E., [approx. Lat. 42 deg. 34 min. 00 sec. N., Long. 90 deg. 19 min. 52 sec. W., New Diggings 7.5-min quadrangle], Lafayette Co., southwestern WI (Agnew and Heyl, 1946; see Templeton and Willman, 1963, Illinois Geol. Survey Bull., no. 89, p. 235).


AAPG geologic province:

Iowa shelf*
Wisconsin arch*


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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).