State | Idaho |
---|---|
Name | Tonalite, granodiorite, and quartz diorite. |
Geologic age | Cretaceous |
Lithologic constituents |
Major
Igneous > Plutonic > Dioritic > Quartz-diorite (Batholith)Typically hornblende-bearing. Croesus pyroxene-biotite quartz diorite south of Hailey.
Igneous > Plutonic > Granitic > Tonalite (Batholith)Typically hornblende-bearing.
Igneous > Plutonic > Granitic > Granodiorite (Batholith)Typically hornblende-bearing. Also includes granodiorite with potassium feldspar megacrysts that is typically hornblende-bearing and foliated.
Incidental
Igneous > Hypabyssal > Mafic-hypabyssal (Batholith)Early mafic phases of the Bitterroot lobe (~70 Ma).
|
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 | Adams - Blaine - Boise - Bonner - Boundary - Camas - Clearwater - Custer - Elmore - Gem - Idaho - Kootenai - Nez Perce - Owyhee - Valley |