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Looking at Diana's Punchbowl in the middle of the Monitor Valley, Nevada. It consists of a large travertine dome that rises about 75 feet above the surrounding plain with a 50 foot wide gaping hole at the top. The geothermal spring pond is 138*F & tucked 30 feet within, accessible with rope to one side of the pit without falling in. I couldn't see how far deep the water is but it has a nice blue tone. It appears long ago that natural cavities allowed the water to flow out of the base of the hill to the south & east where the grass is noticeably greener. If there were no exit cavities for the water, the hot spring would continue to seep & bubble out of the rim & rebuild travertine terraces (a prime example of this would be Rabbitkettle Hot Springs in the Northwest Territories of Canada & Homestead Crater, Utah).
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