File:Kionoceras sp. (fossil nautiloid) in dolostone (Silurian) 3.jpg

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English: Nautiloids are squid-like creatures that construct long and slightly tapering or coiled, aragonitic, hollow shells with regularly-spaced internal walls. In the fossil record, the original aragonite shell has usually dissolved away, leaving an internal mold (an impression of the shell's interior). Nautiloids were relatively common components of Paleozoic oceans. Most species had straight, slightly tapering shells, but some had loosely coiled or tightly coiled shells. The entire group is represented in today's oceans by five living species of chambered nautilus - Nautilus pompilius, Nautilus macromphalus, Nautilus stenomphalus, Nautilus belauensis, and Allonautilus scrobiculatus.

The host rock here is dolostone, a crystalline-textured chemical sedimentary rock composed of dolomite (CaMg(CO3)2 - calcium magnesium carbonate). Many dolostones appear to be chemically altered limestones.

Classification: Animalia, Mollusca, Cephalopoda, Nautiloidea, Orthocerida, Kionoceratidae

Stratigraphy: unknown Silurian unit (but possibly the Lockport Dolomite, Middle Silurian)

Locality: unknown commercial quarry (but possibly from a quarry north of the town of St. Mary's, northwestern Ohio, USA)

See info. at:

en.wikipedia.org/wiki/Kionoceras
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Source https://www.flickr.com/photos/47445767@N05/50503871238/
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@N05/50503871238. It was reviewed on 20 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

20 October 2020

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current19:29, 20 October 2020Thumbnail for version as of 19:29, 20 October 20202,644 × 1,764 (3.13 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50503871238/ with UploadWizard

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