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Bivalve encrustation: sponge or bryozoan?


Hapchazzard

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Age is Miocene-Pliocene. Bryozoan is an immediate thought, but I'm pretty sure that they're quite rare post Paleozoic, and this kind of encrustation is very common in the locality where the specimen was found. Here is a picture:

nEPpwyy.jpg

 

Bonus thanks if anyone knows with some certainty what the bivalve itself might be from the photo, though I doubt it.

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Yes, I see a bryozoan epibiont in the lower fold on the right. 

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The fossil looks like a very large pecten or scallop. 

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Thank you, everyone that replied! It answered pretty much all of my questions! Yeah, I was also curious about the borings in the bivalve, considering I've seen the exact same borings in modern day shells on the beach, too, and wondered what made them as well. Always assumed it was made by those tiny bivalves that also burrow into rocks. I've got my answer for that now, too.

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