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IonRocks

My most recent Pierre shale find

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IonRocks

Here’s one a friend and I have been trying to settle for a little while.

One end of the argument is that this is an unusual rock carried off the mountains by glaciers.

the other end is that this is a heavily eroded bivalve.

 

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A4C000B7-8C6E-47BC-9FEA-CB1E5BE168CB.jpeg

CF2EF5D3-C960-43CF-AA0C-4500DEA40CCC.jpeg

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IonRocks

For what it may be worth here, the fossil closest in size from this same location. 

FBD72EBF-AE80-4E15-8026-11D02B8C2824.jpeg

E43C0368-FBF5-4B3A-85ED-28D3E2444306.jpeg

678FF3FD-35C1-403B-A636-4425F8B76E84.jpeg

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DPS Ammonite

It looks most like a thick piece of oyster shell with barnacle borings. Check to see if it fizzes in acid which would suggest a shell.

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caldigger

By the way Parker,  nice to see you back here again!

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Xiphactinus

Another vote for clam....probably a big inoceremus.

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IonRocks

Thanks!

maybe these few comments can help convince my friend. 

Hoping to do some more digging at the location for a more complete specimen.

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