Amphibolite formed from metamorphism of mafic sills; includes rocks north- west of Salmon (~1380 Ma) and east of Elk City. (Mesoproterozoic Intrusive Rocks).
State Idaho
Name Amphibolite.
Geologic age Mesoproterozoic
Lithologic constituents
Metamorphic > AmphiboliteAmphibolite formed from metamorphism of mafic sills.

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 Idaho - Lemhi