File:Leptaena fossil brachiopods in fossiliferous limestone (Middle Devonian; Olentangy River bank near Lazarus Run, Delaware County, Ohio, USA) 7 (31132339051).jpg
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Leptaena fossil brachiopod in fossiliferous limestone from the Devonian of Ohio, USA. Brachiopods are sessile, benthic, filter-feeding, marine invertebrates. They first appear in Cambrian rocks and were abundant in Earth's oceans throughout the Paleozoic. They were also common in Mesozoic oceans, but are scarce in modern oceanic biotas. Brachiopods have two shells, called valves, that are usually calcareous (made of calcite - CaCO3 - calcium carbonate). Each shell of a brachiopod is bilaterally symmetrical, unlike each shell of a bivalve (clam). The fossils shown above are a distinctive strophomenid brachiopod called Leptaena. It is characterized by having prominent concentric wrinkles on both the dorsal and ventral valves. This genus has been reported from the Ordovician to the Mississippian. Classification: Animalia, Brachiopoda, Articulata (a.k.a. Rhynchonelliformea), Strophomenida, Rafinesquinidae Stratigraphy: derived from the upper Columbus Limestone or lower Delaware Limestone, Middle Devonian Locality: large loose slab along the eastern side of the Olentangy River, just upstream from the Lazarus Run-Olentangy River confluence, western side of Chapman Road, south of the town of Delaware, central Delaware County, central Ohio, USA (~40º 14’ 00.22” North latitude, ~83º 03’ 39.70” West longitude) |
| Date | |
| Source | Leptaena fossil brachiopods in fossiliferous limestone (Middle Devonian; Olentangy River bank near Lazarus Run, Delaware County, Ohio, USA) 7 |
| 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@N05/31132339051 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:59, 7 December 2019 | | 4,000 × 3,000 (5.4 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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