File:Columnar basalt.jpg

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On road to Lake Ann trailhead see Geology of North Cascades (Tabor and Howland) p. 89 Figure 73

This basalt forms in columns which are oriented vertically, with the polygons (in this case mainly hexagons) forming as the basalt cools and shrinks.
Date
Source originally posted to Flickr as Columnar basalt
Author J Brew
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This image, which was originally posted to Flickr, was uploaded to Commons using Flickr upload bot on 23 March 2009, 00:39 by Agne27. On that date, it was confirmed to be licensed under the terms of the license indicated.
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12 August 2006

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current00:59, 23 March 2009Thumbnail for version as of 00:59, 23 March 20092,592 × 1,944 (1.55 MB)Flickr upload botUploaded from http://flickr.com/photo/93452909@N00/214550451 using Flickr upload bot

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