Misc. Idaho Geology

Articles from Digital Geology of Idaho site of interest –

Neogene Snake River Plain-Yellowstone Volcanic Province < has good map

Challis Magmatic Episode < has map yeah, that Challis!

That place, Challis, Idaho which has so many quakes lately is full of old volcanoes!

[snip] “…The Challis Volcanic Group covers approximately 25,000 square kilometers in Idaho , making it the largest of the Eocene volcanic fields (Figure 2). The Eocene geologic setting of the Challis volcanics is commonly accepted as an extensional basin related to the subduction of the oceanic Farallon Plate beneath the continental North American Plate. Prior to Eocene time, before ~60 Ma, the convergence rate of the Farallon and North American Plates was very fast.”

  Fun Fact:The caldron under Yellowstone started out to the right, under Idaho and moved left.

“The Yellowstone hot spot first appears about 17 million years ago with rhyolite eruptions on the Owyhee Plateau of southeast Oregon and northern Nevada. The hot spot slowly migrates across southern Idaho to its present-day position at Yellowstone National Park.”  – Idaho history



4 thoughts on “Misc. Idaho Geology

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s