File:Brachiopods in limestone (Richmondian Stage, Upper Ordovician; Southgate Hill roadcut, Indiana, USA) 1.jpg

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English: Brachiopods in limestone in the Ordovician of Indiana, USA.

This limestone is part of 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 shown here are mostly strophomenids. Other recognizable fossils and fossil fragments include bryozoans, Isotelus trilobites, and crinoid stem columnals.

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

Stratigraphy: talus derived from the Waynesville Formation or Liberty Formation, Richmondian Stage, upper Cincinnatian Series, upper Upper Ordovician

Locality: Southgate Hill Outcrop - roadcut along Rt. 1, southwest of Cedar Grove & north of St. Leon, southeastern Franklin County, southeastern Indiana, USA (vicinity of 39° 20' 14.26" North latitude, 84° 57' 09.77" West longitude)
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Source https://www.flickr.com/photos/47445767@N05/34551172941/
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@N05/34551172941 (archive). It was reviewed on 4 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

4 March 2020

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current16:26, 4 March 2020Thumbnail for version as of 16:26, 4 March 20204,000 × 3,000 (6.64 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/34551172941/ with UploadWizard

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