Usage:
Tyson Member of Kings Lake Formation of Decorah Group (IL,MO-notably in St. Louis region)
Geologic age:
Late Ordovician (Mohawkian)
Type section, locality, area and/or origin of name:
Type section: exposure in south bluff of Meramec River along St. Louis-San Francisco RR, 0.25 mi northeast of Mincke Siding, near center E/2 SE/4 SE/4 sec. 21, T. 44 N., R. 4 E., Manchester 7.5-min quadrangle, St. Louis Co., eastern MO. Named from Tyson Hollow, a small branch of Meramec Valley, St. Louis Co., eastern MO (Templeton and Willman, 1963).
AAPG geologic province:
Lincoln anticline
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 ([ ]).