File:Basaltic columns Lake Superior.png
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Summary
| Description |
English: Columns of basalt on the northwest shore of Lake Superior
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| Date | 1849 |
| Source | Owen, David Dale (1852) Report of a Geological Survey of Wisconsin, Iowa, and Minnesota, Philadelphia: Lippingcott, Grambo & Co., p. 384 Retrieved on 14 June 2012. |
| Author | Sketch by Richard Owen, engraved by J. W. Orr, on wood by S. Wade |
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