Channel in bedrock, a slate of moderate strength, worn by tailings of Cherokee hydraulic mine in eight years gross time. The net period is estimated at less than two years. Depth of channel 10 feet. Butte County, California. 1905. Courtesy U.S. Geological Survey. The USGS home page is http://www.usgs.gov
This photograph is by carnkie and was uploaded December 23rd 2009. © carnkie please do not copy or distribute without prior express permission.
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