File:Fossil rugose coral in limestone (Girkin Limestone, Upper Mississippian; Dixon Cave Trail, Mammoth Cave, Kentucky, USA) 10 (8330428120).jpg

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Rugose coral in limestone in the Mississippian of Kentucky, USA.

The weathered limestone surface shown above includes a solitary rugose coral. Rugose corals are an extinct group of solitary and colonial cnidarians. They are often nicknamed "horn corals", in reference to the upside-down horn shape of the skeletons of solitary forms (Ex: <a href="https://www.flickr.com/photos/jsjgeology/15590522272">www.flickr.com/photos/jsjgeology/15590522272</a>). Solitary rugose corals made solid, tapering skeletons of calcite (CaCO3 - calcium carbonate). During life, a polyp (sea anemone animal) lived in a cup-like depression at the top of the skeleton.

This rugose coral appears to be silicified (the original calcite skeletons have been replaced by quartz/silica, SiO2).

Classification: Animalia, Cnidaria, Anthozoa, Rugosa

Stratigraphy: Girkin Limestone, lower Upper Mississippian

Locality: trailside outcrop, Dixon Cave Trail, between Mammoth Cave's Historic Entrance & Dixon Cave, northern Mammoth Cave Ridge, Mammoth Cave National Park, western Kentucky, USA
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Source Fossil rugose coral in limestone (Girkin Limestone, Upper Mississippian; Dixon Cave Trail, Mammoth Cave, Kentucky, USA) 10
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@N05/8330428120 (archive). It was reviewed on 14 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

14 October 2019

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current17:12, 14 October 2019Thumbnail for version as of 17:12, 14 October 20192,304 × 1,296 (753 KB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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