Usage:
Joliet Dolomite (IL)
Joliet Formation (IL)
Joliet Limestone (IL*)
Subunits:
Brandon Bridge Member, Markgraf Member, Romeo Member
Geologic age:
Silurian (Llandovery to Ludlow)*
Type section, locality, area and/or origin of name:
Type section: National Stone Company quarry, includes all strata above weathered and pitted surface occurring 1 to 3 ft above STRICKLANDIA PYRIFORMIS zone up to near top of quarry, Joliet, Will Co., northeastern IL (Savage, 1926).
AAPG geologic province:
Illinois 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 ([ ]).