Usage:
Bristol Hill Coal Member of Bond Formation (IL*)
Geologic age:
Late Pennsylvanian (Missourian)*
Type section, locality, area and/or origin of name:
Type section: exposure along Bristol Hill, in center NE/4 NE/4 sec. 12, T. 6 N., R. 11 W., Heathsville 7.5-min quadrangle, Crawford Co., IL (Nance and Treworgy, 1981).
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 ([ ]).