Hot spring water flowed into what Robert W. Limbert coined "Indian bath tubs" while exploring the Bruneau Valley in 1921. Some petroglyphs can be seen near the water that is pouring into the hole. Limbert's caption: "The tub is a limestone canyon from the sides of which hundreds of hot springs gush forth. The erosive action of these streams has carved out a circular hole some twenty feet across and about fifteen feet deep, the bottom of which slopes gradually to the center. Fully a hundred jets of warm water, ranging in size from the diameter of a lead pencil to that of a man's wrist spout out from openings along the sides with a temperature just right for bathing."
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