Usage:
No current usage in the U.S. Name still used in Canada.
(â Siyeh Limestone of Piegan Group of Belt Supergroup (MT) replaced with Helena Dolomite (or Formation). See Helena.)
Geologic age:
Mesoproterozoic
Type section, locality, area and/or origin of name:
Mount Siyeh, at head of Canyon Creek in the Swift Current drainage, Glacier Co., MT (Willis, 1902).
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 ([ ]).