Challis Volcanic Group. (IDTcv;0)

Challis Volcanic Group.

Dacite, andesite, and rhyolite tuffs and flows and subordinate basalt and latite flows; covers large area in south-central Idaho. Includes Absaroka Volcanic Group near Henrys Lake and scattered volcanic rocks in eastern and northern Idaho. (Eocene Challis Magmatic Complex and Related Sedimentary Rocks).

State	Idaho
Name	Challis Volcanic Group.
Geologic age	Eocene
Lithologic constituents	Major Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic-tuff, Flow) Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic-tuff, Flow) Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic-tuff, Flow) Minor Igneous > Volcanic > Felsic-volcanic > Latite (Flow) Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
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	NGMDB product page for 97750
Counties	Bingham - Blaine - Bonneville - Butte - Camas - Clark - Clearwater - Custer - Fremont - Gooding - Idaho - Latah - Lemhi - Owyhee - Valley

Challis Volcanic Group.

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.