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Here are two links to posts dealing with how to post pictures on Black River Fossils forums.
1. How to Post Pictures on Black River Fossils Forums by ditchweezil
2. How to Post Pictures on Black River Fossils Forums by Daryl
I found three of these on my last trip down to SC. Its hard to tell for sure if your find is identical to mine but it sure looks close. Of the three, one was in a streambed and two were from the quarry at Cross. They are definitely not mammalian teeth and I'm fairly certain they are the brain case from a species of fish.
Thanks for the ID info Xiphodan. I hope to get a confirmation on that from the museum soon. I've always suspected it was some sort of fish fossil, but could never figure out what part. I did a quick search on fish brain cases but didn't turn up anything that looks quite like my specimen yet. One reason for thinking that this specimen was a fish fossil of some sort is because if the blackish colored patina covering it. I have some large fish vertebra I believe that have this same coloring. The verts might be Tuna but I'm not sure. I'll have to dig them out to look at them again.
Daryl.
I got an ID on my mysterious fossil. Dr. Purdy from the Museum of Natural History (Smithsonian) ID'd this fossil as a Hyperosotic fin spine from a Spade fish. I've done a little bit of google searching on this ID and haven't turned up anything yet. I'll keep searching to see if I find a similar example.