File:Cystiphylloides americanum (fossil coral) (Columbus Limestone, Middle Devonian; Delaware County, Ohio, USA) 1 (33774851600).jpg

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Cystiphylloides americanum (Edwards & Haime, 1851) - fossil coral from the Devonian of Ohio, USA.

This is a silicified, solitary rugose coral ("horn coral"). Solitary rugose corals have tapering calcitic skeletons. During life, a polyp (sea anemone animal) lived in the cup at the top of the skeleton. This particular coral experienced several growth interruptions during life - probably due to storms on shallow seafloors. These interruptions account for the ragged appearance of the outer skeletal surface.

The fossil has been silicified (replaced by quartz/silica - SiO2). Silicified fossils are more resistant to weathering than surrounding host rocks. Upon weathering and erosion, such fossils stand out in relief, or are weathered completely free of matrix, as is this specimen.

The yellowish-brownish coloration is from iron oxide staining.

Classification: Animalia, Cnidaria, Anthozoa, Rugosa, Cystiphyllidae

Stratigraphy: Columbus Limestone, Middle Devonian

Locality: undisclosed site in Delaware County, central Ohio, USA

See info. at:

<a href="https://en.wikipedia.org/wiki/Rugosa" rel="nofollow">en.wikipedia.org/wiki/Rugosa</a>
Date
Source Cystiphylloides americanum (fossil coral) (Columbus Limestone, Middle Devonian; Delaware County, Ohio, 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@N05/33774851600 (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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Date/TimeThumbnailDimensionsUserComment
current03:29, 5 December 2019Thumbnail for version as of 03:29, 5 December 20191,842 × 1,587 (1.92 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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