File:Zygospira modesta (fossil brachiopods) in limestone (Upper Ordovician; southeastern Butler County, Ohio, USA).jpg

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English: Zygospira modesta (Say in Hall, 1847) - fossil brachiopods in limestone from the Ordovician of Ohio, USA.

This rock 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.

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). Seen here is a plate of Zygospira modesta, a small but abundant brachiopod in the Cincinnatian.

Classification: Animalia, Brachiopoda, Articulata (a.k.a. Rhynchonelliformea), Atrypida, Anazygidae

Stratigraphy: undetermined unit, Cincinnatian Series, Upper Ordovician

Locality: loose piece from railroad cut immediately south of Interstate 75 overpass at exit 21 (Cincinnati-Dayton Road exit), southeastern Butler County, southwestern Ohio, USA
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Source https://www.flickr.com/photos/47445767@N05/50017117887/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50017117887. 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.

13 October 2020

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current01:24, 13 October 2020Thumbnail for version as of 01:24, 13 October 20202,751 × 2,510 (5.32 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50017117887/ with UploadWizard

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