Idaho Batholith

Castle Peak is the highest point on the Idaho Batholith

The Idaho Batholith is a granitic and granodioritic batholith of Cretaceous age that covers approximately 35,000 square kilometres (14,000 sq mi) of central Idaho. The batholith has three lobes that are separated from each other geographically and geologically. The Kaniksu lobe is in the Idaho Panhandle, while the Bitterroot and Atlanta lobes are in central Idaho but separated by the Belt Supergroup metamorphic rocks that compose the Salmon River Arch. The Bitterroot lobe is 85 to 65 million years old, and the Atlanta lobe is 100 to 75 million years old.[1] Much of the Atlanta and Bitterroot lobes are in the Idaho Batholith ecoregion while the Kaniksu lobe is in the Northern Rockies ecoregion.[2]

References

  1. ↑ DeGrey, Laura; Miller, Myles; Link, Paul K. "Mesozoic Idaho Batholith". Idaho State University. Archived from the original on December 22, 2014. Retrieved December 22, 2014.
  2. ↑ "Ecoregions of Idaho". U.S. Environmental Protection Agency. Retrieved December 22, 2014.