File:Megalomoidea canadensis fossil bivalve (Lockport Dolomite, Middle Silurian; quarry in northwestern Ohio, USA) 3 (14968873643).jpg

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Megalomoidea canadensis (Hall, 1852) fossil bivalve (internal mold) (dorsal view of hinge line) from the Silurian of Ohio, USA (5.5 cm from top to bottom).

This is a famous fossil clam from the Silurian of Ohio. These fossils were frequently found by quarrymen working Silurian dolostones - they called them "beefhearts" because they are remarkably similar in size and appearance to the hearts of cows.

"Beefhearts" are really internal molds of large fossil bivalves - the original aragonite shells have dissolved away. All that's left is impressions of the inside surfaces of the shells. The internal mold itself is composed of the same material as the host rocks - dolostone. Dolostone is a finely-crystalline textured, chemical sedimentary rock composed of the mineral dolomite (CaMg(CO3)2 - calcium magnesium carbonate).

Orientation: anterior to the bottom; posterior to the top; dorsal (hinge line) is the central vertical axis; biologic right is to the left; biologic left is to the right

Classification: Animalia, Mollusca, Bivalvia, Heterodonta, Hippuritoida, Megalodontidae (this fossil clam was formerly known as Megalomus canadensis)

Stratigraphy: Lockport Dolomite, upper Niagaran Series, (upper Wenlockian), upper Middle Silurian

Locality: quarry in northwestern Ohio, USA
Date
Source Megalomoidea canadensis fossil bivalve (Lockport Dolomite, Middle Silurian; quarry in northwestern Ohio, USA) 3
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14968873643. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

6 May 2015

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current19:03, 6 May 2015Thumbnail for version as of 19:03, 6 May 20151,484 × 2,276 (754 KB)Natuur12 (talk | contribs)Transferred from Flickr via Flickr2Commons

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