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Geologists began digging a 400-foot-long trench Friday to determine if a 95-mile scar across the Great Plains east of Denver is Colorado's longest earthquake fault. The Anton Scarp is an arrow-straight cliff face, up to 100 feet high in some spots, in Washington County. The Colorado Geological Survey is excavating the 20-foot-deep trench along the scarp about five miles northeast of Anton. Credit: Colorado Geological Survey

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