File:Boxwork (22590857700).jpg
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| Description |
Boxwork is a fairly rare cave formation. It's formed when dissolved calcium carbonate crystallized in cracks in surrounding rock. The surrounding rock then erodes away and leaves the boxlike calcite crystals which appear to be box-like. Here, we see boxwork in Wind Cave, South Dakota, which is the first cave national park and currently the 6th most extensive cave network in the world. It's also famous for its large concentration of boxwork. Photo credit: Alex Demas, USGS. |
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| Source | Boxwork |
| Author | U.S. Geological Survey from Reston, VA, USA |
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This image was originally posted to Flickr by U.S. Geological Survey at https://flickr.com/photos/27784370@N05/22590857700 (archive). It was reviewed on 19 January 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the Public Domain Mark. |
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:48, 19 January 2018 | | 2,000 × 1,500 (2.6 MB) | Artix Kreiger 2 (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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