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My most recent Pierre shale find


IonRocks

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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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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.

My goal is to leave no stone or fossil unturned.   

See my Arizona Paleontology Guide    link  The best single resource for Arizona paleontology anywhere.       

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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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