By Jean Cross
Though the Town of Prescott Valley is celebrating its 25th Anniversary of Incorporation this year, its history is much older, about ten million years older. It was that long ago that 'Glassford Hill' erupted and spewed the surrounding area with its lava rocks known as basalt. Then ten thousand years ago or so, mammoth roamed 'Lonesome Valley.' In 1983, a hiker walking the Agua Fria Wash near 89A discovered large bones protruding from the banks of the wash and realized these were not cattle bones.
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