File:Halysites louisvillensis fossil coral, Jefferson County, Kentucky.jpg

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Halysites louisvillensis (apparent junior synonym of Halysites nitidus) from the Louisville Limestone (upper Middle Silurian to lower Upper Silurian) of Jefferson County, Kentucky, USA. This colony has been silicified - the original skeleton was composed of calcium carbonate (CaCO3). (Falls of the Ohio State Park collection, Clarksville, Indiana, USA)

The halysitids are a group of extinct, Paleozoic-aged colonial corals. They are readily identifiable - their corallites are linked end-to-end in a distinctive pattern resembling chains (hence the common name “chain corals”). Halysitids are one of the several families of Paleozoic tabulate corals. They were an important reef-building component in the Silurian throughout the world. They occur in shallow-water marine carbonate facies.

Classification: Animalia, Cnidaria, Anthozoa, Tabulata, Halysitidae
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Source Halysites louisvillensis fossil coral (Louisville Limestone, upper Middle Silurian to lower Upper Silurian; Jefferson County, Kentucky, USA)
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15018463300. It was reviewed on 15 September 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

15 September 2014

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