File:Geodized Mercenaria permagna (fossil bivalve shell) with calcite (Nashua Formation, Lower Pleistocene; near Okeechobee, Florida, USA) 1.jpg

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English: Mercenaria permagna Conrad, 1838 - geodized fossil bivalve shell with calcite crystals from the Pleistocene of Florida, USA

Seen here is honey-colored, coarsely-crystalline calcite filling the interior of a fossil clam shell. Geodized fossil mollusc shells occur in some horizons in the Plio-Pleistocene of southern Florida - these include Mercenaria bivalve shells and large Busycon gastropod shells. Fluids rich in dissolved calcium carbonate filled the empty interiors of these shells and precipitated calcite crystals. The gray material on the specimen is a coquina-like matrix.

Classification: Animalia, Mollusca, Bivalvia, Venerida, Veneridae

Stratigraphy: may be from the Fort Drum Member, Nashua Formation, Lower Pleistocene (also referred to as the Ruck's Pit Mine Formation)

Locality: unrecorded / undisclosed site in Florida (probably a quarry / mine - possibly a site east of the town of Fort Drum), attributed to "near Okeechobbee"
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Source https://www.flickr.com/photos/47445767@N05/52857498223/
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@N05/52857498223. It was reviewed on 30 April 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

30 April 2023

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current18:05, 30 April 2023Thumbnail for version as of 18:05, 30 April 20233,452 × 2,535 (6.18 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52857498223/ with UploadWizard

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