Usage:
Shepard Formation of Missoula Group of Belt Supergroup (ID*,MT*)
Spelled Sheppard in early reports.
Geologic age:
Mesoproterozoic*
Type section, locality, area and/or origin of name:
Forms crest of Lewis Range in vicinity of Mount Cleveland and Sheppard [Shepard] Glacier, Glacier National Park, Glacier Co., northwestern MT, between Belly River and central Flattop Mountain (Willis, 1902).
Type locality: Cliffs of Lewis Range near Shepard Glacier, Glacier National Park, Glacier Co., northwestern MT (Fenton and Fenton, 1937).
AAPG geologic province:
Northern Rocky Mountain region*
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 ([ ]).