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File:Tar volcanoes in the Carpinteria Asphalt mine (cropped).jpg

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English: A tar volcano in the Carpinteria Asphalt mine, showing how oil exudes from joint cracks in the upturned Monterey shale forming the floor of mine. Santa Barbara County, California. October 16, 1906. Plate 3-A in U.S. Geological Survey. Bulletin 321. 1907. Image file: /htmllib/btch347/btch347j/btch347z/arn00533.jpg
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Source http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Arnold,%20R.%20533
Author Arnold, R. USGS
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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.

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current14:48, 16 April 2016Thumbnail for version as of 14:48, 16 April 20161,248 × 785 (829 KB)Tillman (talk | contribs)File:Tar volcano in the Carpinteria Asphalt mine.jpg cropped 11 % horizontally and 22 % vertically using CropTool with lossless mode.

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