Paul Black explained how Mount Diablo was formed by lava squirting “like toothpaste” through layers of rock while he polished a piece of Woodward Ranch Plume Agate. He was yelling. The decibels were ...
ANTIOCH — As he polished a piece of Woodward Ranch plume agate, Paul Black explained how Mount Diablo was formed by lava squirting “like toothpaste” through layers of rock. He was yelling. The ...
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