Crinoid or coral, maybe Fletcheria?

[Durkheim]

Found on the Delaware coast, in the surf. The segmented columns are irregular, waving independently as opposed to a regular pattern as in a hard coral. They seem to come out of a central stem like a crinoid, but there are so many tendrils, I am doubting that guess.

My 7 yo son found it and is dying to learn more about it, so a genus would help a lot.

Thanks!

Paul

 

[Rockwood]

This looks like a favositid (tabulate) coral to me. Must have tumbled down out of the hills to the west.