Usage:
Ravinia facies (informal) in Henry Formation of Mason Group (IL*)
[?] Ravinia Sand Member of Lake Michigan Formation (MI)
(†Ravinia Sand Member of Lake Michigan Formation abandoned as formal term by the IL Geol. Survey.)
For informal usage, the rank or lithologic term should not be capitalized.
Geologic age:
Quaternary (Pleistocene to Holocene)*
Type section, locality, area and/or origin of name:
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 (Willman and Frye, 1970).
AAPG geologic province:
Michigan basin*
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 ([ ]).