Petrified sequoias of Malm Gulch, Idaho (2 of 2): ancient huge trees encased in volcanic ash

This is part two of a two video series on Malm Gulch, Idaho. In this video, geology professor Shawn Willsey showcases the fantastic fossilized sequoia stumps encased in solidified ash (tuff) of the Eocene Challis volcanics, a collection of volcanic and sedimentary rocks that were deposited in central Idaho about 45-51 million years ago. Learn how these stately giants yield important information about the ancient climate of central Idaho and how petrified or fossilized wood forms. If you missed it, also check out the first video which focuses on the angular unconformity and impressive conglomerate the forms the base of the Challis volcanics. This area is featured in my book, Geology Underfoot in Southern Idaho.

GPS coordinates: 44.33377, -114.22465

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Shawn Willsey
College of Southern Idaho
315 Falls Avenue
Twin Falls, ID 83303