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Challis intrusive rocks.

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Shallow roots of Challis volcanic field. Older suite of granodiorite and quartz monzodiorite and subordinate diorite, granite, and subvolcanic dacite; includes Jackson Peak, Beaver Creek, Marsh Creek, and Summit Creek stocks (49-45 Ma). Younger suite of granite and minor syenite and subvolcanic rhyolite; includes Sawtooth, Casto, Bungalow, and Lolo Hot Springs plutons (47-43 Ma). (Eocene Challis Magmatic Complex and Related Sedimentary Rocks).
State Idaho
Name Challis intrusive rocks.
Geologic age Eocene
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Granite (Pluton)Younger suite of granite.
Igneous > Plutonic > Dioritic > Quartz-monzodiorite (Stock or pipe)Older suite of granodiorite and quartz monzodiorite.
Igneous > Plutonic > Granitic > Granodiorite (Stock or pipe)Older suite of granodiorite and quartz monzodiorite.
Minor
Igneous > Plutonic > Syenitic > Syenite (Pluton)Younger suite - minor syenite and subvolcanic rhyolite.
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-dacite (Stock or pipe)Older suite - subordinate diorite, granite, and subvolcanic dacite.
Igneous > Plutonic > Dioritic > Diorite (Stock or pipe)Older suite - subordinate diorite, granite, and subvolcanic dacite.
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-rhyolite (Pluton)Younger suite - minor syenite and subvolcanic rhyolite.
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.
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