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I've got a rarity to try and confirm today, folks. The seller says it's an Acrocanthosaurus tooth. It is from the Cedar Mountain fm. (if I remember correctly, tooth morphology has not been described from this formation) in Grand County, Utah. The serration density per 5mm is about 17 on the mesial side and about 15 on the distal side. Due to its possible rarity, I understand that I may have to provide more information about the tooth, so let me know if there is additional specifications needed.
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Weird Reptile-like Mammal, Cretaceous, Grand County, Utah
Oxytropidoceras posted a topic in Fossil News
Weird reptile-like mammal species discovered amid ancient Utah dinosaur bones by David DeMille, USA Today, The Spectrum, May 30, 2018 https://www.usatoday.com/story/news/nation-now/2018/05/30/reptile-mammal-species-fossil-utah-pangea/654547002/ Scientists discover the fossilized skull of a mammal-like critter under a dinosaur’s foot in Utah — and then it gets even weirder, The Salt Lake Tribune, May 30, 2018 https://www.sltrib.com/news/education/2018/05/29/scientists-discover-the-fossilized-skull-of-a-mammal-like-critter-under-a-dinosaurs-foot-in-utah-and-then-it-gets-even-weirder/ Why you should care about this 130-million-year-old fossil The ancient find, unearthed in Utah, bridges the transition from reptiles to the beginning of mammals and changes our view of continental drift, too By Zen Vuong, USC News, May 23, 2018 https://news.usc.edu/143411/why-you-should-care-about-this-130-million-year-old-fossil/ The this paper is: Adam K. Huttenlocker; David M. Grossnickle; James I. Kirkland; Julia A. Schultz; Zhe-Xi Luo (2018). "Late-surviving stem mammal links the lowermost Cretaceous of North America and Gondwana". Nature. in press. doi:10.1038/s41586-018-0126-y. Yours, Paul H.-
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