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Image: Headward erosion

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Description: Gully developing headward by sapping and modified by slipping. Two miles southeast of Mount Tamalpais. A characteristic landslip hollow at right. Compare 2835. Tamalpais quadrangle, Marin County, California. 1906. Digital File:ggk02834 ID. Gilbert, G.K. 2834 Original found at http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Gilbert%2C%20G.K.%202834 Image uploaded to illustrate article headward erosion.
Title: Headward erosion
Credit: the English language Wikipedia (log)
Author: Grove Karl Gilbert. Uploaded to Wikipedia by en:User:Cuppysfriend.
Permission: This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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