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Challis Volcanics Region

Recent earthquakes in the region.

Rhyolitic ash flow tuffs

  • Intermediate to mafic
  • Granitic plutons with pink, scattered crystals

Granitic

pluton

Rock Types

  • Silicic Volcanic Rocks
  • volcanic history led to Igneous rock types

Phase Two

  • .... Intermediate to mafic lava flows
  • Then volcanic eruptions about 51 to 45 million years ago

Phase One

  • The granitic plutons were formed about 52 million years ago

Dashed line=

extent of the

tuff region

.... and it moved west

The subduction slowed

Two Phase History

... setting off more igneous activity

Steep slopes

Large glacial

valleys

Present Topography:

Characteristics

High mountain

ranges.

Video: KPVI News , April 16

Sources:

Geology.isu.edu

imh.isu.edu/geomap.htm

Natural resources

Hydroelectricity

Rivers

Minerals

Fishing

Timber

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