need help id bones

[clay14]

don't think in right place need help id these bones any info will be appreciated


think the first one is a gill plate but i maybe wrong

 

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[Harry Pristis]

The first object is a plastral element from a soft-shell turtle (part of the framework of bone supporting the soft, upper shell).

The second object appears to be a rock.

The last object could be a fragmentary vertebral centrum, but the images are not good enough to say more.