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Since 1919, the Idaho Geological Survey (formerly Bureau of Mines and Geology) has studied and reported on the general and environmental geology of the state. The Survey also studies and reports on the water (both surface and ground), mineral data, and energy assets of the state.
Generalized map of the Idaho Batholith showing the Atlanta lobe, the Bitterroot lobe, and the Challis suite. The Idaho Batholith is a granitic and granodioritic batholith of Cretaceous-Paleogene age that covers approximately 25,000 square kilometres (9,700 sq mi) of central Idaho and adjacent Montana.
There are at least 115 named mountain ranges in Idaho. Some of these ranges extend into the neighboring states of Montana , Nevada , Oregon , Utah , Washington , and Wyoming . Names, elevations and coordinates from the U.S. Geological Survey , Geographic Names Information System .
The Snake River Plain is a geologic feature located primarily within the U.S. state of Idaho. It stretches about 400 miles (640 km) westward from northwest of the state of Wyoming to the Idaho-Oregon border. The plain is a wide, flat bow-shaped depression and covers about a quarter of Idaho.
Purcell and Rocky Mountain Trenches within the US. The Priest River complex in northern Idaho, northeastern Washington, and southeastern British Columbia is a series of early and middle Eocene metamorphic core complexes that extend southward from the south-central Canadian Cordillera to the Columbia Plateau and southeastward to the Idaho Batholith. [1]
The forest is in an area known as the Idaho Cobalt Belt, which consists of a 34 miles (55 km) long geological formation of sedimentary rock that contains some of the largest cobalt deposits in the U.S. [6] Idaho has two time zones, with the dividing line approximately midway between Canada and Nevada.
Geologic map of the Belt Supergroup in Idaho. The Belt Supergroup is an assemblage of primarily fine-grained sedimentary rocks and mafic intrusive rocks of late Precambrian (Mesoproterozoic) age.
A specimen of stibnite. The Stibnite Mining District sits atop the Idaho Batholith, one of the signature features of Idaho’s unique geology.The Idaho Batholith is nearly 14,000 square miles (36,000 km 2) of granite, formed from the collision of the oceanic plate and the North American Plate around 100 million years ago during the Cretaceous period. [10]