I know this is an old thread sorry. I have a very similar fossil that I found in a pallet of Pennsylvania fieldstone back in late 2010/early 2011. I have kept it all these years always meaning to research it and just this morning stumbled across it and decided to do some googling and happened to find this thread.
I really do believe mine is two or three digits of a human hand or possibly a dinosaur with a very similar skeletal structure in its feet.