Lemhi Group.

Feldspathic fine-grained quartzite, siltite, and subordinate argillite and carbonate-bearing rocks in east-central Idaho; includes Apple Creek, West Fork, Inyo Creek, Big Creek, and Gunsight formations. (Mesoproterozoic Metasedimentary Rocks of Lemhi Subbasin of Belt Basin).
State Idaho
Name Lemhi Group.
Geologic age Mesoproterozoic
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > MetasiltstoneSiltite.
Metamorphic > Metasedimentary > Metaclastic > QuartziteFeldspathic fine-grained quartzite.
Minor
Metamorphic > Metasedimentary > Metaclastic > Argillite
Sedimentary > CarbonateCarbonate-bearing rocks in east-central Idaho.
References

Lewis, Reed S., Link, Paul K., Stanford, Loudon R., and Long, Sean P., Geologic Map of Idaho, 2012, Idaho Geological Survey, Geologic Map 9 (M-9); Scale 1:500,000.

NGMDB product
Counties Clark - Custer - Idaho - Lemhi - Valley