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Hi there. I found this on a field trip to a private quarry in Midlothian , TX (just south of Dallas). It was in limestone / shale in the ATCO formation, where there’s lots of shark teeth and fish bones. I’m pretty sure it’s been compressed as most of the shark spines I’ve seen are much more round and this is pretty oval shaped. Does anyone have any guesses as to species? Thanks in advance!

Found this in some midlothian matrix. Is it possible to tell what species of ptychodus this is from these photos? I originally assumed posterior p. whippeli but I am not great at identifying ptychodus teeth. Any help would be much appreciated. 6mm long

Finally got to visit the Midlothian Quarry in North Texas a few weeks ago. I had made arrangements in August with the Quarry to visit in September, not realizing it was two days after I got back from England, but it worked out GREAT because it's almost a 4 hour drive from my house to Midlothian, so I had to be up at 4:30am....but since I was still basically on England time....that was no problem! Four other members of the HIll Country Fossil Club and I met with Doyle, one of the quarrymen who took us deep into the quarry to our fossil hunting spot. It is so amazing that they open up a working quarry to fossil hunters! Free of charge! And they had water and bananas and popsicles! Who could ask for more? Oh, plus safety hats, vests and glasses! We look so very dashing..... Doyle kept appologizing for not having "turned over the fossil beds" for better hunting and promised he would do so the next time we came! He was so very accomodating and helpful and told us lots of stories of other fossil hunters. He did like to tell a good story! All of us found a variety of sharks teeth (Thanks to Andrew Dunham for being our identifier on the spot) and one lucky lady (Emily) found a full fish (both sides of a split shale piece). It was rather hot, but we had a great time. I look forward to going back when a bit cooler and we can spend more time! Cretodus - my final find of the day....had gone over to Emily to see if she was done, looked down and this one was just sitting on the ground waiting for me.....wish it had its tip, but ah well! Another Cretodus Not sure what this one is...any ID suggestions? Ptychodus whipplei Squalicorax ( i love that you can see the serrated edges) I love the shark teeth but I really was hoping to find a mosasaur tooth or vertebra...but I was happy to find a fish vertebra! My first one! And this MAY be a very pyratized ammonite...I think. I hope. The HIll Country Fossil Club! Our Hunting Grounds...there is a REALLY large pit behind those piles