File:Isorthoceras sociale (fossil nautiloid) (Elgin Member, Maquoketa Formation, Upper Ordovician; Graf, Iowa, USA).jpg

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English: Isorthoceras sociale (Hall in Miller, 1877) - fossil nautiloid from the Ordovician of Iowa, USA. (~2.75 centimeters across at its widest)

This species is also known as Dolorthoceras sociale.

Seen here is a nautiloid cephalopod. 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.

Classification: Animalia, Mollusca, Cephalopoda, Nautiloidea, Orthocerida, Pseudorthoceratoidea, Pseudorthoceratidae, Spyroceratinae

Stratigraphy: ~mid-Elgin Member, Maquoketa Formation, Upper Ordovician

Locality: roadcut immediately southwest of Graf (= S1/2, NW1/4, SW 1/4 section 29, T89N, R1E), northwestern side of the Little Maquoketa River, Dubuque County, eastern Iowa, USA
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Source https://www.flickr.com/photos/47445767@N05/49072574473/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49072574473. 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 20202,500 × 1,571 (1.99 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49072574473/ with UploadWizard

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