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Abstract

Siliceous sinter forms around geysers and hot springs by the deposition of amorphous silica and is well preserved in fossil systems. Except for geyserite, siliceous sinter has biogenic structures principally derived from thermophilic bacteria, which live in the hot water of pools, outflow channels, and sinter terraces. The species of bacterium process unique temperature ranges, and much work on thermophilic bacteria at Yellowstone National Park has been undertaken by a number of biologists (e.g., Castenholz, 1969; Brock, 1978). Structural studies on present-day siliceous sinter forming in Yellowstone National Park have been well documented by Walter (1976).

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