Publisher's Synopsis
Excerpt from Geysers of Yellowstone National Park
The deposits of which the beautiful geyser cones and terraces consist are mainly silica, for the slightly alkaline waters in the present geyser areas come from rhyolites. These deposits are built up by thin layers often intricately fluted or of a lacework pattern and mostly of pure white color. The region is about feet above sea level and the groups of geysers are mainly in valleys traversed by streams, many of them on the bank of a stream as shown in Tafel 1.
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