Jackito Posted October 3, 2021 Share Posted October 3, 2021 My assistant and I checked out a place in Round Rock, Texas where the Del Rio, Buda, and Eagle Ford are close by. I read about the area in some online papers and I used Google maps to make a plan. I'm new and learning, and we try to explore a couple areas a week. (I'd be happy to share the address if any local folks want to check out the area.) We followed a drainage creek to a bigger creek, and then found some interesting creek walls. I was happy to see something besides Austin Chalk. We trekked through waist deep water and saw some interesting cliffs. We always find frogs, snakes, and lizards too. I didn't find any interesting fossils within the creek walls or floor. But I did find a rock on a gravel bar with some teeth in it. The big one is about 1/2 inch, and the small one is 1cm. I have no idea what they are from. I tried to take pictures using a ruler for scale. Using a little microscope camera I can see the little tooth has a cool serrated edge. Any ideas what the teeth could be from? 3 Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted October 4, 2021 Share Posted October 4, 2021 Not from the frog. 1 1 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
ThePhysicist Posted October 4, 2021 Share Posted October 4, 2021 Looks like y'all got a couple of shark teeth there! The small, serrated one must be Squalicorax, the "crow" shark - it's the only Cretaceous shark with serrations. The larger one is a lamniform "mackerel" shark, but not much else can be said since it's incomplete. It could be Cretolamna or Cretoxyrhina perhaps. 2 "Argumentation cannot suffice for the discovery of new work, since the subtlety of Nature is greater many times than the subtlety of argument." - Carl Sagan "I was born not knowing and have had only a little time to change that here and there." - Richard Feynman Collections: Hell Creek Microsite | Hell Creek/Lance | Dinosaurs | Sharks | Squamates | Post Oak Creek | North Sulphur River | Lee Creek | Aguja | Permian | Devonian | Triassic | Harding Sandstone Instagram: @thephysicist_tff Link to comment Share on other sites More sharing options...
Carl Posted October 4, 2021 Share Posted October 4, 2021 Can we get sharper, better-lit photos of that serrated tooth in multiple views? 1 1 Link to comment Share on other sites More sharing options...
Jared C Posted October 5, 2021 Share Posted October 5, 2021 I agree with Carl. - it seems to me that that serrated tooth is a bit long and stout to be Squalicorax, despite its serrations. The first one especially seems to be a little stout.... I have a hunch you may have something cooler, but more bright, sharp pictures are needed 1 “Not only is the universe stranger than we think, it is stranger than we can think” -Werner Heisenberg Link to comment Share on other sites More sharing options...
Jackito Posted October 7, 2021 Author Share Posted October 7, 2021 I bought a little microscope camera and printed some grid paper. (Coco, I'm trying. I promise!) I also found a couple more teeth in the same rock. Ptychodus? But in seriousness. I appreciate the comments/feedback. Link to comment Share on other sites More sharing options...
Jared C Posted October 7, 2021 Share Posted October 7, 2021 You for sure have a Ptychodus. It seems that squalicorax tooth is broken in half - hence my initial confusion about its shape.Cool find! 2 “Not only is the universe stranger than we think, it is stranger than we can think” -Werner Heisenberg Link to comment Share on other sites More sharing options...
Carl Posted October 8, 2021 Share Posted October 8, 2021 22 hours ago, Jared C said: You for sure have a Ptychodus. It seems that squalicorax tooth is broken in half - hence my initial confusion about its shape.Cool find! Same! 1 Link to comment Share on other sites More sharing options...
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