Postcard of Giant Geyser photographed by Frank J. Haynes, no date. Giant Geyser is a cone-type geyser in the Upper Geyser Basin. Giant Geyser is the namesake for the Giant Group of geysers, which includes Bijou Geyser, Giant Geyser, and Mastiff Geyser. Giant Geyser is also the namesake for the Giant Platform, a raised stone structure incorporating all these geysers. Giant is notable for its spectacular, but sporadic eruptions, as well as for its very large cone of geyserite, which stands about 12 feet tall. Yellowstone National Park is a national park located primarily in the state of Wyoming, although it also extends into Montana and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872. Yellowstone, widely held to be the first national park in the world, is known for its wildlife and its many geothermal features. The park spans an area of 3,468.4 square miles. The Yellowstone Caldera is.
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