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The Challis Arc was an Eocene volcanic field that stretched from southwestern British Columbia through Washington to Idaho, United States. [1] The volcanic field extended between 42 and 49 degrees north latitude and was about 1500 kilometers in length. It exhibited volcanic activity for about 10 million years. [2]
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]
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.
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. The batholith has two lobes that are separate from each other geographically and geologically.
The Wayan Formation is a geological formation in Idaho whose strata date back to the latest Early Cretaceous and the earliest Late Cretaceous.Dinosaur, other reptile, mammal, and micro and macro-floral remains are among the fossils that have been recovered from the formation.
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UTC time: 1983-10-28 14:06:09: ISC event: 567352: USGS-ANSSComCat: Local date: October 28, 1983 (): Local time: 08:06 MDT [1]: Magnitude: 6.9 M w [1]: Depth: 16 km (9.9 mi) [2] Epicenter: 2]: Fault: Lost River Fault [3]: Type: Normal [3]: Areas affected: Central Idaho United States: Total damage: $12.5 million [4]: Max. intensity: MMI IX (Violent) [4]: Landslides: Yes: Aftershocks: 5.6 M w Oct ...
Locations of the Yellowstone hotspot during the past 15 million years. The Bruneau-Jarbidge center is denoted with "12-10" and the light blue area. The Bruneau-Jarbidge volcanic field, also known as the Bruneau-Jarbidge eruptive center [1] is located in present-day southwest Idaho.