File:Paraconularia subulata (fossil conulariid) in dolomitic limestone (Maxville Limestone, Mississippian; Jonathan Creek, north-northwest of Fultonham, Ohio, USA) (26459150517).jpg
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[edit]_in_dolomitic_limestone_(Maxville_Limestone,_Mississippian;_Jonathan_Creek,_north-northwest_of_Fultonham,_Ohio,_USA)_(26459150517).jpg&action=edit§ion=1){kind=link}
| Description |
Paraconularia subulata (Hall, 1858) - fossil conulariid in dolomitic limestone from the Mississippian of Ohio, USA. (pen for scale) (photo by James Cheshire) Conulariids are an uncommon to rare, extinct group of fossil organisms known from the Cambrian to the Triassic. They are most common in Mississippian sedimentary rocks. Their form is best described as "four-sided ice cream cones with ridges". They have a four-sided, tapering skeleton having tetrameral radial symmetry. The skeleton is somewhat flexible, often has a brownish color, and is composed of chitionphosphate (a mixture of chitin and calcium phosphate). Some paleontologists conclude it is an extinct group of cnidarians, or even a group of scyphozoan cnidarians. Others refer to conulariids as an extinct phylum. Available evidence indicates they are triploblastic, and so are not cnidarians at all, which are diploblastic. Very rare soft-part preservation shows the presence of an alimentary canal, with the pointed end of the skeleton oriented downward and attached to a sheath. The partial conulariid shown here is from the Maxville Limestone - it is the only Middle to Late Mississippian-aged stratigraphic unit in Ohio. Its outcrop belt is not extensive - it principally occurs in Muskingum County and Perry County in eastern and southeastern Ohio. The Maxville Formation can also be found as cobbles and pebbles in the basal Sharon Formation (Lower Pennsylvanian), which disconformably overlies Ohio's Mississippian rocks. Paleohills, or erosional outliers, of Maxville Limestone have also been identified. This fossil has been identified by a conulariid expert as Paraconularia subulata, a long-ranging species known from the Kinderhookian to the Chesterian (= Lower Mississippian to Upper Mississippian). Classification: Animalia incertae sedis, Conulata, Conulariida Stratigraphy: lower Maxville Limestone (= "lower member" of the "Jonathan Creek Formation") (but is the near-uppermost preserved Maxville at this site), lower Chesterian Series, lower Upper Mississippian Locality: outcrop on the southern side of Jonathan Creek, a little upstream from Workman Road bridge, north-northwest of the town of Fultonham, southwestern Muskingum County, eastern Ohio, USA |
| Date | |
| Source | Paraconularia subulata (fossil conulariid) in dolomitic limestone (Maxville Limestone, Mississippian; Jonathan Creek, north-northwest of Fultonham, Ohio, USA) |
| 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@N05/26459150517 (archive). It was reviewed on 13 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 18:04, 13 October 2019 | | 3,191 × 3,000 (6.38 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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