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Megalomus Canadensis Bivalve Endocast Silurian from Ohio #18175


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This is an endocast or internal mold of a clam from Woodville, Ohio (Guelph Dolomite).   It measures 5 inches and dates back to the Silurian time period approximately 430 million years ago.  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.

Endocasts like this were formed when the bivalve animal died and its shell filled with sediment.   Over time, the outer shell of the animal then dissolved away, leaving these endocasts behind.  This piece is especially neat because it has some pyrite in the endocast which gives it a bit of sparkle. 

This would be an amazing piece for any collection!   We have a variety of fossils available so be sure to check out our other listings!