Usage:
Lyon Series
Lyonian Epoch
Geologic age:
Permian, Early (?)
Type section, locality, area and/or origin of name:
Named from Lyon Co., KS, site of type localities of Admire group and Americus limestone. Council Grove is a few mi west of the county, and Chase Co. is adjacent on the west (Branson, 1960).
AAPG geologic province:
North America
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 ([ ]).