Found an interesting fossil a few days ago down in my creek. It's not the typical shell stuff. Would like to get it ID'd. I will try to post a pic some time. In the meantime let me know on here or via PM.
Update on "the rock". I forwarded it on to a geologist who spends a lot of time studying fossils. Initial thoughts where fossilized rock/mud cracks when I first forwarded him the pictures. After studying it person he does not believe this is the case and has forwarded the rock onto a paleontologist for further review.
The geologist and paleontologist both said it is rock from the Devonian era. They estimated it at 250 millions years old. One of the geologists initial thoughts was as mentioned by another poster that a crystalline mineral deposits was initially there and was eroded out. After looking at it in person he isn't so sure but that is still a possibility.