Usage:
Jelm Formation of Chugwater Group (CO*,WY*)
Subunits:
(alphabetical): Red Draw Member (CO*,WY*), Sips Creek Member (CO*,WY*), Troublesome Creek Sandstone Member (WY).
Geologic age:
Triassic, Late*
Type section, locality, area and/or origin of name:
Near east base of Jelm Mountain, Laramie quadrangle, Albany Co., WY. Named from Jelm Mountain (Lee, 1927).
Reference section: Red Mountain, in sec. 16, T. 12 N., R. 76 W., Albany Co., WY (Pipiringos, 1968).
AAPG geologic province:
Green River basin*
Denver basin*
Yellowstone province
Wind River basin
North Park 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 ([ ]).