Glacial deposits.

Till and outwash consisting of gravel, sand, silt, and clay. Formed by valley glaciers at higher elevations and by the Cordilleran ice sheet in northern Idaho. Includes deposits of several glacial episodes. Includes rock glacier deposits and some modern alluvium derived from reworked till and outwash. (Quaternary Sediments).
State Idaho
Name Glacial deposits.
Geologic age Pleistocene
Lithologic constituents
Major
Unconsolidated > Fine-detrital (Glacial-till, Glacial-outwash, Alluvial)Silt and clay; till and outwash. Includes rock glacier deposits and some modern alluvium derived from reworked till and outwash.
Unconsolidated > Coarse-detrital (Glacial-till, Glacial-outwash, Alluvial)Gravel and sand; till and outwash. Includes rock glacier deposits and some modern alluvium derived from reworked till and outwash.
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 - Bear Lake - Blaine - Boise - Bonner - Bonneville - Boundary - Butte - Camas - Cassia - Clearwater - Custer - Elmore - Franklin - Fremont - Idaho - Lemhi - Shoshone - Teton - Valley