File:Rafinesquina ponderosa (fossil brachiopod) (Grant Lake Formation, Upper Ordovician; south of Excello, Ohio, USA) 1 (49710941141).jpg
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[edit]DescriptionRafinesquina ponderosa (fossil brachiopod) (Grant Lake Formation, Upper Ordovician; south of Excello, Ohio, USA) 1 (49710941141).jpg |
Rafinesquina ponderosa Ulrich in Hayes & Ulrich, 1903 - fossil brachiopod in limestone from the Ordovician of Ohio, USA. (view of ventral valve; hingeline at top) This specimen 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, all richly fossiliferous. Most of the limestones are event beds (= tempestites), deposited during ancient storms. Seen here is a brachiopod, a group of 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). Classification: Animalia, Brachiopoda, Articulata (also known as Rhynchonelliformea), Strophomenida, Rafinesquinidae Stratigraphy: "Grant Lake Formation" (apparently from the Mount Auburn Member), Maysvillian Stage, middle Cincinnatian Series, Upper Ordovician Locality: Excello South outcrop - roadcut on the western side of Route 4, just south of the Route 4-Route 73 intersection, south of the town of Excello, eastern Butler County, southwestern Ohio, USA (39° 28’ 28.84” North latitude, 84° 24’ 29.25” West longitude) |
Date | |
Source | Rafinesquina ponderosa (fossil brachiopod) (Grant Lake Formation, Upper Ordovician; south of Excello, Ohio, USA) 1 |
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@N05/49710941141. It was reviewed on 14 April 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
14 April 2020
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Date and time of data generation | 23:39, 28 March 2020 |
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File change date and time | 01:56, 29 March 2020 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 23:39, 28 March 2020 |
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Scene capture type | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 21:56, 28 March 2020 |
Unique ID of original document | C29D9A3D49B620E8ADFC68E8E2D143AD |