- Usage in publication:
-
- Ravinia Sand Member
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Sand
- AAPG geologic province:
-
- Michigan basin
Summary:
Pg. 78; Illinois Bull., no. 95, p. 232, 1975. Ravinia Sand Member of Lake Michigan Formation. Well-sorted, medium-grained, nearly white beach sand containing local lenses of gravel. Separated from rest of formation at base of the low-water swash zone. Grades laterally into Waukegan Member of Lake Michigan; sands occurring offshore are included in the Waukegan. Age is Holocene.
Type exposure: in Ravinia, where there is an accessible section of the Lake Michigan beach, in W/2 sec. 31, T. 43 N., R. 13 E., Lake Co., northeastern IL. Named from Ravinia, in the southern part of Highland Park, Lake Co., northeastern IL.
Source: Publication; Hdbk Illinois stratigraphy (Illinois Geol. Survey Bull. 95, p. 232); US geologic names lexicon (USGS Bull. 1520, p. 254).
- Usage in publication:
-
- Ravinia sand facies (informal)*
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Michigan basin
Summary:
Pg. 17-18, 57, 63, 64. Ravinia facies (informal) in Henry Formation of Mason Group. [= finer grained sediment of former Ravinia Sand Member of Lake Michigan Formation; the coarser grained sediment is included in the Dolton facies (informal) in Henry Formation. Interpreted to be of nearshore lacustrine origin. Age is considered Pleistocene (Wisconsinan Age; Woodfordian Subage), based on age of the Henry, and Holocene.]
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 ([ ]).