File:Zaphrentis phrygia fossil rugose coral (Jeffersonville Limestone, Middle Devonian; Falls of the Ohio, southern Indiana, USA) 1 (15590522272).jpg

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Zaphrentis phrygia Rafinesque & Clifford, 1820 fossil rugose coral (view of cardinal side) from the Devonian of Indiana, USA (~2.4 cm from top to bottom).

Exceedingly fossiliferous rocks of the Jeffersonville Limestone are well exposed at the famous Falls of the Ohio outcrop (Indiana side of the Ohio River at Louisville). These Middle Devonian rocks have abundant colonial and solitary corals (tabulates and rugosans), plus other typical Paleozoic shallow carbonate seafloor invertebrates (e.g., brachiopods, bryozoans, crinoids). This is a silicified, solitary rugose coral ("horn coral") with borings (= the long slits). Solitary rugose corals have tapering calcitic skeletons. During life, a polyp (sea anemone animal) lived in the cup at the top of the skeleton. The shells and skeletons in portions of the Jeffersonville Limestone have been silicified (replaced by quartz/silica - SiO2). The silicified fossils are more resistant to weathering than the limestone host rock. Upon weathering and erosion, the fossils stand out in relief, or are weathered completely free of matrix, as is this specimen.

Classification: Animalia, Cnidaria, Anthozoa, Rugosa, Zaphrentidae

Stratigraphy: Jeffersonville Limestone, lower Middle Devonian

Locality: northern shore of the Ohio River, across from the city of Louisville, west of the Falls of the Ohio rapids, southern margin of Clark County, southern Indiana, USA (vicinity of 38° 16' 42.32" North, 85° 45' 57.79" West)

See info. at:

<a href="https://en.wikipedia.org/wiki/Rugosa" rel="nofollow">en.wikipedia.org/wiki/Rugosa</a>
Date
Source Zaphrentis phrygia fossil rugose coral (Jeffersonville Limestone, Middle Devonian; Falls of the Ohio, southern Indiana, USA) 1
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@N05/15590522272 (archive). It was reviewed on 5 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

5 December 2019

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current03:27, 5 December 2019Thumbnail for version as of 03:27, 5 December 20191,136 × 1,752 (487 KB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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