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File:Pahasapa Limestone (Lower Mississippian; Wind Cave Canyon, Black Hills, South Dakota, USA) 1.jpg

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English: Limestone in the Mississippian of South Dakota, USA.

South Dakota's Black Hills have many limestone cave systems, including two of the world's longest caves - Jewel Cave and Wind Cave. Seen here is a limestone outcrop near the natural entrance to Wind Cave. Both Jewel Cave and Wind Cave are developed in the Lower Mississippian Pahasapa Limestone.

Limestone is a common sedimentary rock composed of calcite (CaCO3 - calcium carbonate). Most limestone are ancient warm, shallow ocean deposits.

From park signage:

Paha Sapa Limestone

All Black Hills caves have formed in this layer 300 to 600 feet thick. Originally it was laid down on a shallow seabottom about 300 million years ago. Its name derives from the Lakota word meaning "Black Hills".

Locality: outcrop in Wind Cave Canyon, Wind Cave National Park, southern Black Hills, southwestern South Dakota, USA
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Source https://www.flickr.com/photos/47445767@N05/53172436450/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/53172436450. It was reviewed on 11 September 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

11 September 2023

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current07:42, 11 September 2023Thumbnail for version as of 07:42, 11 September 20233,008 × 2,000 (6.04 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53172436450/ with UploadWizard

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