- Usage in publication:
-
- Wasco Member
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Sand
- Gravel
- AAPG geologic province:
-
- Wisconsin arch
Summary:
Pg. 72; Illinois Bull., no. 95, p. 226, 1975. Wasco Member of Henry Formation. Ice-contact sand and gravel, largely in kames, eskers, and deltas. At some localities it is mostly cobbles and boulders. Is a discontinuous unit with variable thickness throughout area of Wisconsinan glaciation. Commonly rests on Weldron Formation and underlies Richland Loess. Age is Pleistocene (Wisconsinan Age; Atltonian Subage).
Type section: gravel pit along the Chicago Great Western RR, in SE/4 NW/4 sec. 24, T. 40 N., R. 7 E., Kane Co., northeastern IL. Named from village of Wasco, Kane Co., northeastern IL.
Source: Publication; Hdbk Illinois stratigraphy (Illinois Geol. Survey Bull. 95, p. 226); US geologic names lexicon (USGS Bull. 1520, p. 328-329).
- Usage in publication:
-
- Wasco facies (informal)*
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Wisconsin arch
Summary:
Pg. 16, 18, 56, 57. Wasco facies (informal) in Henry Formation of Mason Group. The lithogenetic-defined Wasco Member of Willman and Frye is retained as an informal sedimentary facies useful in understanding glacial history and in mapping glacial deposits. [Age is considered Pleistocene (Wisconsinan Age; Woodfordian Subage), based on age of Henry Formation.]
Source: Publication.
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 ([ ]).