Good morning all!
While I was magnifying a shell which looks similar to a modern scallop I noted several discoid shaped objects in the matrix, so I cleaned them away and these are the best pictures I have so far. It measures 458um in diameter and is heavily crystallized. It is a very fossiliferous Pennsylvanian layer is all I can i.d. On the right track or way off? I have both sides depicted but the edge also has small "pores"/discreet nodules but can't get a pick of that yet. I will try to get some better pictures too. Thanks for looking and comments appreciated! Bone