File:Odontopleurid trilobite cheek (Arnheim Formation, Upper Ordovician; Middletown, Ohio, USA).jpg
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| Description |
English: This fossil trilobite fragment 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.
Trilobites are extinct marine arthropods. They first appear in Lower Cambrian rocks and went extinct at the end of the Permian. Trilobites had a calcitic exoskeleton and nonmineralizing parts underneath (legs, gills, gut, etc.). The calcite skeleton is most commonly preserved in the fossil record, although soft-part preservation is known in some trilobites (Ex: Burgess Shale and Hunsruck Slate). Trilobites had a head (cephalon), a body of many segments (thorax), and a tail (pygidium). Molts and carcasses usually fell apart quickly - most trilobite fossils are isolated parts of the head (cranidium and free cheeks), individual thoracic segments, or separated pygidia. The name "trilobite" was introduced in 1771 by Johann Ernst Immanuel Walch and refers to the tripartite division of the trilobite body - it has a central axial lobe that runs longitudinally from the head to the tail, plus two side lobes (pleural lobes). Seen here is the librigena ("free cheek") of an odontopleurid trilobite, possibly Acidaspis. Odontopleurids are distinctive in being highly spinose - note the spines along the margin of this sclerite. Classification: Animalia, Arthropoda, Trilobite, Polymerida, Odontopleuridae Stratigraphy: float from the Arnheim Formation, lower Richmondian Stage, upper Cincinnatian Series, upper Upper Ordovician Locality: loose piece from roadcut along Breiel Boulevard, immediately south of the Route 73-Breiel Boulevard intersection (bottom of the hill), Middletown, northeastern Butler County, southwestern Ohio, USA (vicinity of 39° 32' 36.60" North latitude, 84° 20' 41.41" West longitude) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/49997431261/ |
| 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@N05/49997431261. It was reviewed on 13 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 | 01:54, 13 October 2020 | | 982 × 729 (518 KB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49997431261/ with UploadWizard |
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