Image: Wind Cave lower

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Description: This boxwork in the lower part of Wind Cave was inundated after its formation and was coated with a layer of macrorystalline pool spar, making it thicker and more massive than that in the upper cave.
Author: Dave Bunnell / Under Earth Images
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes

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List of national parks of the United States

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