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Valmont Dike 
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Aerial view of the Valmont dike. 

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The Valmont dike just east of Boulder cuts the Pierre shale.

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A thin-section of the Valmont dike.  A slice of rock is mounted on glass and ground to 3/10,000th of an inch thick (thinner than a piece of paper).  It is viewed under the microscope with polarized light.
Last Updated: 11/5/2012 4:09 PM 
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