Mike Oskin (UC Davis) and Drake Singleton (U.S. Geological Survey) dig a trench. The shores prevent the walls from collapsing. The pink flags indicate locations where charcoal samples were collected for C14 dating

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Mike Oskin (UC Davis) and Drake Singleton (U.S. Geological Survey) dig a trench. The shores prevent the walls from collapsing. The pink flags indicate locations where charcoal samples were collected for C14 dating

Mike Oskin (UC Davis) and Drake Singleton (U.S. Geological Survey) dig a trench. The shores prevent the walls from collapsing. The pink flags indicate locations where charcoal samples were collected for C14 dating

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