File:Nautiloid cephalopod (gravel bar clast, Chatham, Ohio, USA).jpg

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English: (centimeter scale)

This sample is from a gravel bar along a creek at Chatham, Ohio. The rock itself is a siltstone or fine-grained sandstone, likely derived from Upper Paleozoic rocks (maybe the Mississippian). The elongated structure is an eroded mold of a nautiloid cephalopod. A nautiloid is a squid-in-a-shell. Modern nautiloids have coiled shells (e.g., www.flickr.com/photos/jsjgeology/24052827562). In the fossil record, most nautiloids have long, straight, slightly tapering shells. The concave-anteriorly internal septae are visible in this fossil - they are walls that divided the originally hollow shell into chambers. Hints of where the siphuncle was are present. The soft-parts of the squid animal itself occupied the living chamber on the left side of the fossil.

Classification: Animalia, Mollusca, Cephalopoda, Nautiloidea

Provenance: modern fluvial clast derived from Pleistocene glacial drift

Locality: gravel bar on the western side of the town of Chatham, northern Licking County, east-central Ohio, USA
Date
Source https://www.flickr.com/photos/47445767@N05/39463969990/
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@N05/39463969990. 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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Date/TimeThumbnailDimensionsUserComment
current19:29, 20 October 2020Thumbnail for version as of 19:29, 20 October 20201,992 × 1,823 (2.49 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/39463969990/ with UploadWizard

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