File:Fossiliferous limestone (Greenhorn Formation, Upper Cretaceous; Ponca State Park, Nebraska, USA) 1.jpg

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English: (outdoor public display, Ashfall Fossil Beds State Historical Park, Nebraska, USA)

Limestone is the # 3 most common sedimentary rock in the world. It is composed of calcium carbonate (CaCO3) - usually calcite, but sometimes aragonite. Most limestones were deposited in ancient warm, shallow ocean environments. Many examples have a mix of whole fossils, fragmented fossils, and fine-grained mud - such samples are called fossiliferous limestone. Seen here is Cretaceous-aged fossiliferous limestone from the American Great Plains. The fossils are inoceramid bivalve shells that lived in the ancient Western Interior Seaway, which existed when global sea levels were fairly high.

Stratigraphy: Greenhorn Formation, Upper Cretaceous

Locality: attributed to Ponca State Park, far-northeastern Nebraska, USA
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Source https://www.flickr.com/photos/47445767@N05/52268756149/
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@N05/52268756149. It was reviewed on 12 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

12 November 2022

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current19:11, 12 November 2022Thumbnail for version as of 19:11, 12 November 20222,741 × 2,000 (4.09 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52268756149/ with UploadWizard

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