File:Nautiloid cephalopod in limestone (Waynesville Formation, Upper Ordovician; Roaring Run, Warren County, Ohio, USA) 1.jpg
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English: Nautiloid cephalopod in limestone in the Ordovician of Ohio, USA. (bedding plane view)
This fossil plate is from the famous Cincinnatian Series of the tristate area of Ohio-Kentucky-Indiana. Rocks in the Cincinnatian were deposited in relatively shallow marine facies during the Late Ordovician. The Cincinnatian succession is mostly interbedded limestones and shales. Most of the limestones are event beds (= tempestites), deposited during ancient storms. The fossiliferous limestone shown above is eroded from an outcrop of the Waynesville Formation, a richly fossiliferous marine unit in the upper Cincinnatian Series. Overall, the Waynesville is about 30% limestone and 70% shale - it was deposited in a shallow carbonate platform setting, but well below fair weather wave base. The prominent fossil is an erosional cross-section through a straight-shelled nautiloid cephalopod. Nautiloids were relatively common components of Paleozoic oceans. They were basically squids-in-shells. Most species had straight, slightly tapering shells, but some had loosely coiled or tightly coiled shells. The shells were mostly hollow, aragonitic, and had regularly-spaced internal walls. The entire group is represented in today's oceans by five living species of chambered nautilus, all of which have a coiled shell: Nautilus pompilius, Nautilus macromphalus, Nautilus stenomphalus, Nautilus belauensis, and Allonautilus scrobiculatus. Seen here is a partial mold of a nautiloid. The original aragonite shell has dissolved away. The slightly curved "segments" are sediment-filled interior chambers. Classification: Animalia, Mollusca, Cephalopoda, Nautiloidea Stratigraphy: Waynesville Formation, Richmondian Stage, upper Cincinnatian Series, upper Upper Ordovician Locality: Roaring Run, Caesar Creek Lake State Park, northeastern Warren County, southwestern Ohio, USA (vicinity of 39° 28' 41.63" North latitude, 84° 03' 46.83" West longitude) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/41432930590/ |
| 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@N05/41432930590. 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 | | 3,436 × 1,967 (5.23 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/41432930590/ with UploadWizard |
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