Usage:
Ironton Member of Franconia Sandstone (IL*,WI*)
Ironton Member of Wonewoc Formation (IA,WI)
Ironton Sandstone (IL,IN,MN*,WI)
Ironton Sandstone of Knox Group (IL-notably in southern part)
Ironton Sandstone of Munising Group (IN)
Ironton Sandstone Member of Franconia Sandstone (MI*)
Geologic age:
Late Cambrian*
Type section, locality, area and/or origin of name:
Ironton, Sauk Co., WI (Thwaites, 1923).
Natural cliff next to Highway 58 at north edge of village of Ironton (Clayton and Attig, 1990).
AAPG geologic province:
Cincinnati arch
Iowa shelf
Sioux uplift*
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 ([ ]).