Devonian Lycopsid?

[Petebeh]

I found this interesting fossil in the area of the Beltzville dam in Pennsylvania. Exposures in the area are generally Upper Devonian Mahantango Formation so I was surprised to see what looked to me like a lycopsid plant. The area where I spotted this find was mostly devoid of fossils but there were exposures with usual marine fauna within a few hundred yards. If anyone has any thoughts, I would appreciate it!

[Rockwood]

I'm pretty sure these are shells. Likely brachiopods. Tectonic movements are responsible for the appearance.

[Tidgy's Dad]

I agree. 

Those are brachiopod imprints, I think. 

[Petebeh]

Ohhh that would make a lot more sense! Thanks!

[Wrangellian]

Still a collectible specimen, I think! I would take that whole chunk home as is.