Usage:
New London Member of Dunleith Formation of Galena Group (IL)
Geologic age:
Late Ordovician (Mohawkian; Chatfieldian)
Type section, locality, area and/or origin of name:
Type section: in roadcut and bluff east of U.S. Highway 61 on north side of Salt River, in NE/4 SW/4 sec. 25, T. 56 N., R. 5 W., [approx. Lat. 39 deg. 37 min. 09 sec. N., Long. 91 deg. 24 min. 32 sec. W., New London 7.5-min quadrangle], Ralls Co., northeastern MO (Templeton and Willman, 1963, p. 125; Willman and Buschbach, 1975, Illinois Geol. Survey Bull., no. 95, p. 47-87).
Named from New London, [New London 7.5-min quadrangle], Ralls Co., northeastern MO, 2 mi south of type section (Templeton and Willman, 1963, p. 125; Willman and Buschbach, 1975).
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 ([ ]).