Looking south in Eureka slate quarry showing horizontal joints cut by cross joints. Quarry owned by Monson Maine Slate Company. Monson, Piscataquis County, Maine. Circa 1905. Courtesy U.S. Geological Survey. Photo Clapp, F. G.
This photograph is by carnkie and was uploaded December 26th 2009. © carnkie please do not copy or distribute without prior express permission.
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