Usage:
Billman Creek Formation of Livingston Group (MT*)
Geologic age:
Late Cretaceous (Maastrichtian)*
Type section, locality, area and/or origin of name:
Type section: near Billman Creek, in S/2 sec. 13, T. 2 S., R. 8 E., and in W/2 sec. 18, T. 2 S., R. 9 E., Park Co., south-central MT. Named from Billman Creek (Roberts, 1963; see also Roberts, 1972).
AAPG geologic province:
Central Montana uplift*
Montana folded belt*
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 ([ ]).