File:Coiled nautiloid (Skelley Member, Upper Pennsylvanian; Caldwell West outcrop, Ohio, USA) 1.jpg
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English: Coiled nautiloid from the Pennsylvanian of Ohio, USA.
This fossil nautiloid is from the Skelley Member, the youngest fully marine unit in all of Ohio (marginal marine fossils occur in the Permian-aged lower Washington Formation; reports of marine fossils in the Monongahela Group of far-eastern Ohio are erroneous, based on misidentification of fossil microconchids as Spirorbis worm tubes). The Skelley is one of several marine limestone intervals in the Conemaugh Group, an Upper Pennsylvanian cyclothemic succession in eastern Ohio that contains nonmarine shales, marine shales, siltstones, sandstones, coals, marine limestones, and chert ("flint"). Nautiloids are basically a squid-in-a-shell. Only a few species are alive in modern oceans (see the chambered nautilus photos at: www.flickr.com/photos/jsjgeology/albums/72157659717065690). Most nautiloids had long, slightly tapering shells. Some had open-whorled shells and some had tightly coiled shells, as in this example. Fossil cephalopods have not been reported from the Skelley Member, according to the latest paleontological literature on Ohio's Pennsylvanian cephalopods (Sturgeon et al., 1997). This specimen is incomplete, which makes identification uncertain, but the knobby ornament at top and left is consistent with Metacoceras (Order Nautilida, Family Tainoceratidae) (en.wikipedia.org/wiki/Metacoceras). Classification: Animalia, Mollusca, Cephalopoda, Nautiloidea Stratigraphy: float from the Skelley Member (likely derived from the shale facies of the Skelley Member), upper Conemaugh Group, lower Virgilian Series, Upper Pennsylvanian Locality: Caldwell West outcrop, roadcut on the northern side of Rt. 78, between Arnold Road and Interstate-77, just west of the town of Caldwell, west-central Noble County, eastern Ohio, USA (39° 44' 22.82" North latitude, 81° 32' 17.95" West longitude) Reference cited: Sturgeon, M.T., D.L. Windle, R.H. Mapes & R.D. Hoare. 1997. Pennsylvanian cephalopods of Ohio. Ohio Geological Survey Bulletin 71. 260 pp. |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/29650934281/ |
| 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@N05/29650934281. 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. |
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| current | 19:29, 20 October 2020 | | 3,093 × 2,677 (6.57 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/29650934281/ with UploadWizard |
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