File:Leptaena richmondensis (fossil brachiopods) (Upper Ordovician; Brookville Causeway roadcut, Franklin County, Indiana, USA) 1.jpg
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English: Leptaena richmondensis Foerste, 1909 - brachiopods in limestone from the Ordovician of Indiana, USA.
These fossils are 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. 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 brachiopods at center, left, and lower right are distinctive strophomenids called Leptaena, which are characterized by having prominent concentric wrinkles on both the dorsal and ventral valves. This genus has been reported from the Ordovician to the Mississippian. The odd-looking fossil at far-right is the ventral side of a partially-exposed cranidium of Ceraurus milleranus Miller & Gurly, 1893, a rare cheirurid trilobite. Classification: Animalia, Brachiopoda, Articulata (also known as Rhynchonelliformea), Strophomenida, Rafinesquinidae, Leptaeninae Stratigraphy: float from the upper Waynesville Formation or lower Liberty Formation, Richmondian Stage, upper Cincinnatian Series, upper Upper Ordovician Locality: roadcut along Brookville Causeway Road (upper cut), just west & uphill from Brookville Reservoir, western Fairfield Township, northern Franklin County, southeastern Indiana, USA (39° 30' 27.05" North latitude, 85° 00' 26.00" West longitude) See info. at: en.wikipedia.org/wiki/Leptaena |
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| Source | https://www.flickr.com/photos/47445767@N05/49999027287/ |
| 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@N05/49999027287. 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 | 01:24, 13 October 2020 | | 3,788 × 2,363 (6.49 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49999027287/ with UploadWizard |
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