File:Intraclastic pebbly limestone (Ste. Genevieve Limestone, Middle Mississippian; Boone Avenue, Mammoth Cave, Kentucky, USA) 5 (37972685672).jpg

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Intraclastic pebbly limestone in the Mississippian of Kentucky, USA.

This is an unusual limestone horizon in western Kentucky's Mammoth Cave, the longest cave on Earth, with 412 mapped miles as of fall 2017. Most limestones are fossiliferous limestones or micritic limestones (= fine-grained) or oolitic limestones. This example has limestone pebbles - such rocks are called intraclastic limestones. The pebbles are angular and have been interpreted as being produced and deposited during a high-energy storm event or by erosive tidal currents (see Palmer, 1981). Angular pieces were tossed around by storm wave action. This lithology occurs in a laterally-persistent horizon.

Stratigraphy: Spar Mountain Member, Ste. Genevieve Limestone, upper Middle Mississippian

Locality: western wall of Boone Avenue at Y-intersection of Boone Avenue with Rose's Pass, Mammoth Cave Ridge, western Kentucky, USA

Reference cited:

Palmer, A.N. 1981. A Geological Guide to Mammoth Cave National Park. Teaneck, New Jersey, USA. Zephyrus Press. 196 pp.
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Source Intraclastic pebbly limestone (Ste. Genevieve Limestone, Middle Mississippian; Boone Avenue, Mammoth Cave, Kentucky, USA) 5
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/37972685672 (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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current17:59, 13 October 2019Thumbnail for version as of 17:59, 13 October 20194,000 × 3,000 (5.04 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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