Sehoo Mountain, Fallon, Churchill Co., Nevada, USAi
|Regional Level Types|
|Fallon||- not defined -|
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Latitude & Longitude (WGS84):
39° 25' 9'' North , 118° 35' 45'' West
Latitude & Longitude (decimal):
Köppen climate type:
Near the top of Sehoo Mountain an ash fall consolidated into a very fine grained tuff. The tuff silicified possibly by hot spring waters to form a non- porphyritic rhyolite. During the process of alteration the rhyolite took on very colorful patterns of swirls and bands. This ornamental rock has been used by lapidaries over many decades. It is known by the trade name “wonderstone”.
The rhyolite overlays a thick flow of pale greenish-gray porphyritic dacite. Samples of these rocks can be obtained at this location however, there are mining claims in the area that must be avoided.
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Morrison, Roger B. (1964), Lake Lahontan: Geology of Southern Carson Desert, Nevada, USGS Professional Paper 401.
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