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please help to id .found in San Benito County California


ALex pet

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Welcome to the Forum.

What rock layer are they from? They sort of look like 2 valves of a bivalve with concentric ridges that enclose an internal mold of sandstone. I don't see any porous bone.

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Looks like shell material to me but I'm just letting you know the experts will want to know where, ocean, creek, mountains etc.and also measurements or pic with something to judge size and maybe a shot of the large end.

 

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I think wildchild33 is right ... 

Great fossil ! Congrats !

Many greetings from Germany ! Have a great time with many fossils :)

Regards Sebastian

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I also found few of the purse oysters you mentioned right next to the big piece . Here are couple more pictures.  There is a line across the piece on one side and it looks like it used to have  sharp points like on crab carapace or lobster.  Thank you.

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1 hour ago, wildchild33 said:

This is along the lines of what I was thinking.  Goes by tree or purse oyster.

 

Isognomon_calv1.jpg

I think you have the right church, but the wrong pew. This looks like an Isognomen. The post looks more curved and pointed to me. I've seen one that can be confused with it but I forget the name.

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Mytilid bivalve would be my guess, something like Mytilus.

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Ya, we get some really huge oyster shells in our fossil beds. So your piece definitely fits the bill.

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Possibly a Crassostrea titan from a Miocene unit like the Santa Margarita Ss.

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