U.S. Geological Survey Photographic Library

ID. Gilbert, G.K. 3254

Earthflow at Blue Tent, A field, supposed to have been previously smooth, is thrown into undulation by a general flow of underlying gravels, the flow being occasioned by hydraulic mining. Nevada County, California. 1909

Earthflow at Blue Tent, A field, supposed to have been previously smooth, is thrown into undulation by a general flow of underlying gravels, the flow being occasioned by hydraulic mining. Nevada County, California. 1909

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