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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 just posted two Ptychodus I think you will enjoy. Look under P. mortoni. They don't look like the smaller P. mortoni teeth that I have, but I was told by a knowledgeable Texas collector that they are typical jumbo mortoni teeth.