File:Scallops (River Hall, Mammoth Cave, Kentucky, USA) 5 (40415175082).jpg

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DescriptionScallops (River Hall, Mammoth Cave, Kentucky, USA) 5 (40415175082).jpg

Scallops developed on Mississippian limestone in a Kentucky cave, USA. (photo by Ljubomir Risteski)

The wavy features shown here are scallops - asymmetrical, curvilinear, ridge-like, dissolutional features formed by flowing water. They somewhat resemble asymmetrical ripple marks, in that they form in a one-directional current, and the short side of each scallop represents the downstream direction.

These examples are on a limestone surface in River Hall in western Kentucky's Mammoth Cave, the longest cave on Earth. The system has 412 mapped miles, as of fall 2017.

Larger, longer scallops formed in slower-moving water. Smaller, shorter scallops formed in rapidly-moving water.

The prominent parting between gray rocks above and brownish-stained rocks below is the stratigraphic contact between the Ste. Genevieve Limestone (above) and the St. Louis Limestone (below).

Stratigraphy: lower Fredonia Member, basal Ste. Genevieve Limestone, upper Middle Mississippian over upper Horse Cave Member, uppermost St. Louis Limestone, Middle Mississippian

Locality: River Hall (Level E), Mammoth Cave, western Kentucky, USA
Date
Source Scallops (River Hall, 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@N05/40415175082 (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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current23:14, 13 October 2019Thumbnail for version as of 23:14, 13 October 20193,024 × 3,469 (6.79 MB)smartcommons>Ser Amantio di NicolaoTransferred from Flickr via #flickr2commons

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