- Usage in publication:
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- Crane member
- Modifications:
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- Original reference
- AAPG geologic province:
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- Wisconsin arch
Summary:
Pg. 153 (fig. 2), 154. Crane member of Mount Simon formation. Name proposed for the relatively fine-grained basal member of the formation. Type section extends from depths of 3,105 to 3,845 feet. Thickness 620 to 740 feet. Overlies a 245-foot arkosic zone above Precambrian granite; underlies Kenyon member (new). Recognized in subsurface of northern Illinois. Age is Late Cambrian.
Type well: depth-interval 3,105 to 3,845 feet, Wyman No. 1 (well 7), in NE/4 NE/4 SE/4 sec. 35, T. 41 N., R. 5 E., DeKalb Co., northern IL. Named from Crane School, 4 mi south of type well.
Source: US geologic names lexicon (USGS Bull. 1200, p. 974).
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 ([ ]).