File:Pentamerus oblongus (fossil brachiopod) (Lockport Dolomite, Middle Silurian; Lime City Quarry, Wood County, Ohio, USA) 1.jpg

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English: Pentamerus oblongus Sowerby in Murchison, 1839 - fossil brachiopod from the Silurian 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).

This large pentamerid brachiopod is an internal mold in dolostone - the original shell has dissolved away, leaving an impression of the shell's interior surface.

Classification: Animalia, Brachiopoda, Articulata (also known as Rhynchonelliformea), Pentamerida, Pentameridae

Stratigraphy: apparently derived from the Guelph Dolomite (= upper Lockport Dolomite), upper Niagaran Series, (~middle to upper Wenlockian), upper Middle Silurian

Locality: Lime City Quarry, northeastern side of Lime City, Perrysburg Township, northern Wood County, northwestern Ohio, USA (41° 32' 13" North latitude, 83° 33’ 45" West longitude)
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Source https://www.flickr.com/photos/47445767@N05/50742980703/
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@N05/50742980703. It was reviewed on 21 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

21 December 2020

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current14:44, 21 December 2020Thumbnail for version as of 14:44, 21 December 20202,876 × 2,508 (4.64 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50742980703/ with UploadWizard

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