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Image: Steins Pillar, Ochoco National Forest, Oregon

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Description: Steins Pillar in the Ochoco National Forest in central Oregon. This is a natural column of the volcanic rock type called ignimbrite, also known as welded tuff, of andesitic composition, that was deposited by pyroclastic flows from a nearby volcano in Oligocene times. (Reference for volcanic details: Waters, A.C (1966) Stein's Pillar Area, Central Oregon, The Ore Bin, volume 28 number 8, August 1966, pages 137 to 144. http://www.oregongeology.org/pubs/og/OBv28n08.pdf Retrieved 2015-01-16.)
Title: Steins Pillar, Ochoco National Forest, Oregon
Credit: http://www.blm.gov/wo/st/en/bpd.html
Author: Bureau of Land Management
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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