Usage:
No current usage.
(†Marsh Formation of Missoula Group of Belt Supergroup (MT) replaced with Snowslip, Shepard, and Mount Shields Formations of the Missoula Group of the Belt Supergroup. See Snowslip, Shepard and Mount Shields.)
Geologic age:
Mesoproterozoic
Type section, locality, area and/or origin of name:
Named from Marsh Creek, north of Marysville, Lewis and Clark Co., Belt Mountains, southern central MT (Walcott, 1899).
Type section: at mouth of Marsh Creek, north of Marysville, Lewis and Clark Co., Belt Mountains, southern central MT. Town of Marysville is 20 mi northwest of Helena (Walcott, 1899; see also Knopf, 1950).
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 ([ ]).