Very Odd Bivalve

[Happybeachfossils]

I find amazing numbers of bivalves on the Oregon coast but this is very odd. Looks like the standard clam but with a preserved internal anatomical structure. Any thoughts?

[jlo]

I would guess that this is a bivalve, partially filled with agate, that has been cut through at an interesting angle.

Sometimes the internal mold of bivalves can get partially or completely replaced by agate.

[Happybeachfossils]

I would guess that this is a bivalve, partially filled with agate, that has been cut through at an interesting angle.

Sometimes the internal mold of bivalves can get partially or completely replaced by agate.

Very possible. We do find clam belly agates which are clear internal molds of the shell. This was just so intricate in detail.