Glassfold Hill is a 13,000-year-old volcano; it's subsequent lava flows created Prescott Valley :
"Prescott Valley has a very rich history. It began about 10 million years ago, when Glassford Hill erupted ... and then about 10,000 years ago, mammoth grazed this valley.
In 1984, hikers discovered bones and tusks (from early mammoths) sticking out of the bank of the Agua Fria Wash."
Here, Watson Lake surrounds a rocky island older than the volcano itself,
on the volcano's expansively granitic west side.
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March 24, 2010