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File:Enlarged ceiling fracture (Sparks Avenue, Mammoth Cave, Kentucky, USA) 4 (47334397132).jpg

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This cleft is in the limestone ceiling of Sparks Avenue, a tubular passage in Mammoth Cave, Kentucky - the longest cave on Earth. As of March 2019, 412 miles of cave passages have been explored and mapped.

This feature formed by dissolutional enlargement of a fracture (joint) in the limestone. Dissolution principally occurred during high-flow events (floods), which result in slightly acidic water being forcefully infiltrated along a fracture.

The rocks here are limestones of the Ste. Genevieve Limestone (upper Middle Mississippian). This portion of the Mammoth Cave system is at level D. A subterranean river used to flow through here.

Locality: ceiling of Sparks Avenue (between River Hall and Mammoth Dome), Mammoth Cave National Park, western Kentucky, USA
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Source Enlarged ceiling fracture (Sparks Avenue, Mammoth Cave, Kentucky, USA) 4
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@N05/47334397132 (archive). It was reviewed on 13 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

13 October 2019

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Date/TimeThumbnailDimensionsUserComment
current17:44, 13 October 2019Thumbnail for version as of 17:44, 13 October 20193,000 × 4,000 (6.38 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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