ynot Posted June 26, 2022 Author Share Posted June 26, 2022 Cool teeth - thanks for adding to this thread. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
Troodon Posted June 26, 2022 Share Posted June 26, 2022 How can any topic be devoid of a Dinosaur reference. Will change that Posterior T rex tooth 5 Link to comment Share on other sites More sharing options...
ynot Posted June 30, 2022 Author Share Posted June 30, 2022 On 6/26/2022 at 8:10 AM, Troodon said: topic be devoid of a Dinosaur reference. My bad Thanks for fixing the obvious flaw in this otherwise perfect thread! 1 Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
ynot Posted June 30, 2022 Author Share Posted June 30, 2022 On 6/26/2022 at 8:10 AM, Troodon said: Posterior T rex tooth Very nice! Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
Rock Hound Posted June 30, 2022 Share Posted June 30, 2022 On 3/14/2018 at 9:15 PM, Brett Breakin' Rocks said: A few posterior teeth from South Carolina , Chandler Bridge fm. C. angustidens and a small P. contortus. Cheers, Brett Nice Angustidens. Link to comment Share on other sites More sharing options...
Rock Hound Posted June 30, 2022 Share Posted June 30, 2022 I realized, that i have a posterior tooth. 1 Link to comment Share on other sites More sharing options...
ThePhysicist Posted July 2, 2022 Share Posted July 2, 2022 I've got several microteeth that I've yet to photograph, but here's a couple: East Coast GW: Modern GW: North Texas "crow" shark: 1 1 "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...
Largemouth Bass Posted February 16, 2023 Share Posted February 16, 2023 (edited) 7 mm posterior meg from the Potomac that is one of my favorite finds. Edited February 18, 2023 by Largemouth Bass 1 Link to comment Share on other sites More sharing options...
digit Posted February 16, 2023 Share Posted February 16, 2023 That one seems about pre-natal in size. Very cool! Cheers. -Ken 1 Link to comment Share on other sites More sharing options...
ThePhysicist Posted April 7, 2023 Share Posted April 7, 2023 These resemble posterior Heterodontus somewhat, but are from a very different shark, Ptychodus from the Late Cretaceous (Turonian) of NTX, all about 5 mm in length. ^ somehow spotted the last one in the field while stooping over to pick up a projectile point. The others were collected while sorting micromatrix. Ptychodus has a fairly unique dentition among sharks, with blunt/domed teeth arranged in rows forming a pavement in the upper and lower jaws suited for crushing hard-bodied prey: ^ from Shawn Hamm's thesis "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...
digit Posted April 7, 2023 Share Posted April 7, 2023 12 hours ago, ThePhysicist said: These resemble posterior Heterodontus somewhat, but are from a very different shark, Ptychodus from the Late Cretaceous (Turonian) of NTX, all about 5 mm in length. It is interesting to observe the convergent evolution of these teeth in sharks that consume hard-shelled prey items. Some years back I discovered extreme posterior teeth from the smallest member of the hammerhead shark family--the Bonnethead Shark, Sphyrna tiburo discovered in the Cookiecutter Creek site. The tooth below also looks a lot like a Heterodontus posterior but you'll (barely) notice a notch in the middle of the two-lobed root which is not found on the Heterodontus teeth. Also, the perpendicular striations coming off the mid-line ridge are absent on the little hammerhead tooth. You can see the transition from grasping teeth in the front of the lower jaw to the crushing teeth posteriorly in this image of a modern bonnethead: I've previously posted in this thread an extreme posterior (commissural--last of the row) tooth also found at Cookiecutter Creek. That one was of the namesake species for this unusual fossil site in Florida, Isistius triangulus. These teeth are about as far from crushing teeth as you can get. http://www.thefossilforum.com/index.php?/topic/82337-extreme-posterior-shark-teeth/&do=findComment&comment=931807 Cheers. -Ken 1 Link to comment Share on other sites More sharing options...
ThePhysicist Posted April 7, 2023 Share Posted April 7, 2023 8 hours ago, digit said: Some years back I discovered extreme posterior teeth from the smallest member of the hammerhead shark family--the Bonnethead Shark, Sphyrna tiburo discovered in the Cookiecutter Creek site. The tooth below also looks a lot like a Heterodontus posterior but you'll (barely) notice a notch in the middle of the two-lobed root which is not found on the Heterodontus teeth. Also, the perpendicular striations coming off the mid-line ridge are absent on the little hammerhead tooth. Wow, that is an amazing tooth! I don't know that I've seen a fossil S. tiburo before. "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...
digit Posted April 7, 2023 Share Posted April 7, 2023 14 minutes ago, ThePhysicist said: I don't know that I've seen a fossil S. tiburo before. They are not common at all. Richard Hulbert recognized this tooth as similar to ones they found in a coastal Georgia site back in 1998. https://www.georgiasfossils.com/new-20k-pleistocene-vertebrates-from-coastal-georgia.html Cheers. -Ken 1 Link to comment Share on other sites More sharing options...
bthemoose Posted October 18, 2023 Share Posted October 18, 2023 Here's a 6.83 mm wide Otodus obliquus from the Aquia Formation (Thanetian) of Charles County, Maryland, USA. 1 Link to comment Share on other sites More sharing options...
bthemoose Posted October 18, 2023 Share Posted October 18, 2023 2.4 mm wide Striatolamia striata (most likely) from the Aquia Formation (Thanetian) of Charles County, Maryland, USA. 1 Link to comment Share on other sites More sharing options...
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