Jigsaw puzzle: New studies lend further evidence of dry times
Photo By Ed Berg
Professor Tom Lowell, left, and students Terry Workman and Alena Giesche take a sediment core in Jigsaw Lake. The core drill extends down through a hole in the plywood platform strapped onto two canoes. The core drill is pushed into the soft sediments by pulling on a rope whose force is multiplied by several sets of pulleys.
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