Usage:
Glaize Creek Member of Hager Limestone of Plattin Group (MO)
Geologic age:
Late Ordovician (Mohawkian; Turinian)
Type section, locality, area and/or origin of name:
Type section: roadcut on northwest frontage road at junction of Jefferson County Road M and U.S. Interstate Highway I-55, in SE/4 NW/4 sec. 30 (projected), T. 42 N., R. 6 E., Herculaneum 7.5-min quadrangle, Jefferson Co., east-central MO (Thompson, 1991).
Reference sections: (1) upper part of Fred Weber Crystal City quarry, in NW/4 NW/4 sec. 16, T. 40 N., R. 6 E., Selma 7.5-min quadrangle; (2) roadcut on St. Charles County Road F, 1.5 mi west of Defiance; (3) first roadcut north of Joachim Creek on U.S. Interstate Highway I-55 north of Pevely: and, (4) first roadcut on U.S. Interstate Highway I-55 south of type section (Thompson, 1991).
AAPG geologic province:
Illinois basin
Ozark uplift
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 ([ ]).