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File:Coiled nautiloid cephalopod in fossiliferous limestone (Lower Mercer Limestone, Middle Pennsylvanian; Rt. 16 roadcut near Trinway, Ohio, USA) 2 (33126379111).jpg

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This fossil nautiloid is in an outcrop of the Lower Mercer Limestone, a widespread, laterally-persistent marine fossiliferous limestone horizon in the Pennsylvanian-aged Pottsville Group of eastern Ohio.

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 (as in this example) and some had tightly coiled shells.

Classification: Animalia, Mollusca, Cephalopoda, Nautiloidea

Stratigraphy: Lower Mercer Limestone, Pottsville Group, lower Atokan Stage, lower Middle Pennsylvanian

Locality: roadcut along the northern side Rt. 16, southern margin of Irish Ridge, west of the Rt. 16-Rt. 60 intersection, northwest of the town of Trinway, northwestern Muskingum County, eastern Ohio, USA (40° 09’ 12.95” North latitude, 82° 02’ 43.27” West longitude)
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Source Coiled nautiloid cephalopod in fossiliferous limestone (Lower Mercer Limestone, Middle Pennsylvanian; Rt. 16 roadcut near Trinway, Ohio, USA) 2
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@N05/33126379111. It was reviewed on 24 June 2017 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

24 June 2017

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current17:35, 24 June 2017Thumbnail for version as of 17:35, 24 June 20173,444 × 2,173 (6.18 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via Flickr2Commons

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