The book Guidebook of the Western United States volume 2 was written by author Geological Survey Us Here you can read free online of Guidebook of the Western United States volume 2 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Guidebook of the Western United States volume 2 a good or bad book?
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Flows of rhyolitic lava filled the depressed basin between the encircling mountains and moved down the outer slopes to a considerable distance. It is the outer edge of these lava flows that the train crosses on entering the shallow rock-ribbed can- yon of Henrys Fork. Here outcrops of rhyolite are seen close to the track for the first time on this line. From the entrance of this can- yon to the end of the railroad the route is across lavas which are older than the basalt underlying the Snake Ri...ver plain. Rhyolite is the predominant rock in Warm River canyon and on the Conti- nental Divide, but basalt, which is interbedded with the rhyolite, and is much more resistant to weathering and erosion, underUes the mesas and caps the canyon cliffs. In the canyon of Henrys Fork rounded outcrops of rhyoHte stick their heads above the river and form the lower part of the vertical walls. Basalt makes the rim of the canyon, and its columnar joint- ing and cellular character may be seen from the train.
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