No current usage.
(†Melville Formation (MT) not used since its introduction, considered invalid. Rocks now included in Fort Union Formation. See Fort Union.)
early Tertiary (Paleocene)
Named from town of Melville, Sweetgrass Co., central MT, which is situated on these beds and is surrounded, within a few miles, by excellent and typical exposures of them (Simpson, 1937).
Central Montana 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 ([ ]).