Idaho Batholith at Lick Creek Summit, northeast of McCall, Idaho

Geology Is Messy: The Idaho Batholith


The Idaho Batholith is a vast chunk of granite that dominates central Idaho. It’s some 15,400 square miles of rock. People talk about it as if it’s a gigantic, homogenous lump of stone. It’s not. Geology is complicated. Most, but not all, geologists agree the Batholith was formed when the Pacific Plate subsumed under the…