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This was found by myself in Ellis County, TX. I believe the formation was the Atco (or at least the Austin Chalk & Eagle Ford, if I’m not mistaken). The scale is in centimeters. I can post other images if needed; these were the two I just happen to have accessible at the moment. A couple of people who saw it in person said it was Squalicorax. I have some Squalicorax that have the well-known distinctive shape, but I also know that Squalis have teeth that don’t have that angled look. I’d never seen a non-angled Squali tooth before. However, when I posted it online in a Facebook group, an experienced shark tooth collector was absolutely adamant that this is Cretoxyrhina. So now I am unsure. I am more inclined to say it is Cretoxyrhina, but I am far less familiar with vertebrates than inverts. Thank you for any help!