Lots of tiny cretaceous bivalves from the Ladd formation

[Ori]

[Fossildude19]

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Where they were found, and the sizes of the individual fossils would be appreciated.

 

Thanks for anything you can add in this respect.

Kind regards,

[Ori]

I couldn't find a way to edit my post so I'll reply here. These are from the baker canyon sandstone of the Ladd formation in silverado canyon, orange county CA. The largest imprint I found is the top fossil in the photo and measures one cm across.