This petroglyph of a circle bisected by a straight line is a classic example of the "water glyph" identified by Bob Ford and Dixon Spendlove in their explorations of Anasazi petroglyphs in southern Utah, northern Arizona, and southeastern Nevada. Ford and Spendlove have discovered that such symbols point to and mark water sources. Did this glyph from Petroglyphs National Monument convey the proximity of the river we know as Rio Grande?
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