Usage:
Blanding Formation (IL,IA)
Subunits:
Informal Dyas member (IA) and Potters Mill member (IA).
Geologic age:
early Silurian (Llandovery)
Type section, locality, area and/or origin of name:
Type section: Royal Princess section in Mississippi River Bluffs, Jo Daviess Co., IL. Named from village of Blanding, 4.8 km south of type section, in Jo Daviess Co., northwestern IL (Willman, 1973).
AAPG geologic province:
Iowa shelf
Wisconsin arch
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 ([ ]).