Syenitic intrusive rocks.

Syenite, quartz syenite, alkali-feldspar granite, and subordinate gabbro (500-485 Ma). Includes Beaverhead, Arnett Creek, Deep Creek, and Yellowjacket plutons southeast and west of Salmon. (Paleocene to Neoproterozoic Sedimentary and Igneous Rocks of the Cordilleran System).
State Idaho
Name Syenitic intrusive rocks.
Geologic age Ordovician and Cambrian
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Alkali-feldspar-granite (Pluton)
Igneous > Plutonic > Syenitic > Syenite (Pluton)
Igneous > Plutonic > Syenitic > Quartz-syenite (Pluton)
Minor
Igneous > Plutonic > Gabbroic > Gabbro (Pluton)
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 Lemhi