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  1. ThePhysicist

    A Physicist's Collection

    While my prime focus is essentially learning how to accurately describe Nature in the precise language of mathematics, I've always been intrigued by natural history - it's actually what started me on the path to physics. The sort of interrogation that paleontology practices provoked me to think and question even further, down to the fundamental science which makes it all work. Collecting fossils has brought a large amount of enjoyment to my life, and is often a welcome distraction from what can sometimes be straining work. The knowledge that I accumulate along the way is also part
  2. isurus90064

    Extraordinary Common Teeth

    Hey guys, I've been off the radar for awhile .. work you know .. been working on Siggraph for those of you who are familiar with software development. Just wanted to start a new topic here .. This one is right at 3.00" - 7.62cm C. carcharias Bahia Inglesa Formation South of Caldera Provincia Copiapo III Regio de Atacama Chile
  3. fossilsonwheels

    Head Scratcher NSR shark tooth

    I got a few NSR shark teeth and this one has me stumped. It’s small at 6mm and not complete but I think an ID is possible given it’s unique features. It has distinct folds and the cusp has an odd bend. I was wondering if it could be a Cretodus tooth of some odd position. That’s my best guess at the moment. I don’t think it’s Goblin or Sand Tiger. Ozan Formation NSR Texas.
  4. readinghiker

    Cretodus cf. semiplicatus?

    This is a well worn tooth from the Cabezon fauna. With the lingual and labial plications, I am assuming this is a Cretodus. The narrow cusp leads me towards C. semiplicatus. However, the accessory cusp is not as triangular as I would expect to see from this species. Am I right in my assumption concerning the species, or am I off base? Thanks!
  5. ThePhysicist

    Cretodus crassidens

    From the album: Sharks

    Cretodus crassidens Eagle Ford Group, Sherman, TX A smaller tooth from one of the largest predatory sharks in the Late Cretaceous (~ 90 Ma). It likely filled a similar niche in its environment that the Great White Shark does today. Its teeth are characterized by pointed side cusps, rounded root lobes, no nutrient groove, a shelf-like lingual root protuberance on anterior teeth, and striations (ridges) at the foot of the crown (on both the main cusp and side cusps). This tooth is as nice as they get in terms of preservation and completeness from this locale - this o
  6. ThePhysicist

    6/17/21 Trip

    From the album: Post Oak Creek

    Nothing extraordinary, but I found an area with several chunks of matrix with teeth in them.
  7. sharko69

    Monster Texas Cretodus

    Got out to my favorite spot for an hour before dark last night. Started to walk down a small slope and saw it. I swear I looked back and away three times not believing what I was seeing. I have found a few monsters in this creek including a few over the two inch mark but could instantly see this one is crazy special. This is by far the largest Cretodus I have ever seen. Not only does it break 2.5 inches but if there were a record for weight, this may be the top. Thought my plesiosaur vert I found in January was my find of the year, think this may have just moved into first place.
  8. Hey ya'll - despite my best efforts I have a very tough time telling apart the teeth of Cretodus and Cretolamna - most of what I gather so far is that it *seems* that the blade on a cretodus is sometimes slightly longer and less robust compared to cretolamna, but this has large variation and might not even be a real pattern worth noting. Any tips?
  9. ThePhysicist

    Cretodus posterior

    From the album: Post Oak Creek

    Posterior Cretodus sp. (crassidens?). 4 mm.
  10. sharko69

    Texas Cretodus

    Have done a bit of hunting at my local creek system that is very close to where I live and have been fortunate to turn up a few large complete Cretodus over the last couple of weeks. Largest are 57mm and 56mm and we’re found just a hundred feet apart two days apart.
  11. ThePhysicist

    8/16/20 Trip

    From the album: Post Oak Creek

    Didn't find much this time. I don't think it's rained in a while - the water looked stagnant. Also was picked over well. Favorite find is the mostly complete Cretodus (found it under a fallen tree).
  12. Captcrunch227

    Cretodus Article Needed Please

    Howdy friends! I'm looking to see if anyone has a copy of this article from JVP that they'd be willing to share please. It appears that Cretodus crassidens is no longer valid in North America. Would be super helpful to give this a read. It was in the Journal of Vertebrate Paleontology Volume 39 Issue 4. A New Large Late Cretaceous Lamniform Shark from North America, with Comments on the Taxonomy, Paleoecology, and Evolution of the Genus Cretodus Kenshu Shimada, Michael J. Everhart Thanks a ton everyone!
  13. Captcrunch227

    COVID Containment Collecting

    After spending a great deal of time in the house lately do to COVID and days and days of rain, I took the family on a nice leisurely walk to our favorite hunting spot on this beautiful North Texas day. While the kids wwere off collecting some beautiful Turitellas and oysters, I had only one thing on the mind, shark teeth. Cretalamna seems to dominate this site, however some large Cretodus semiplicatus have been found. A Ptychodus latissimus and 2 Plesiosaur teeth have also been found at the site, filling us with hope on each trip for an incredible find. The trip was a p
  14. Untitled

    Cretodus crassidens Texas

    From the album: Cretaceous Shark Teeth

    Cretodus crassidens from Eagle Ford Group. Cedar Hill, Texas.
  15. Untitled

    Cretodus crassidens Texas

    From the album: Cretaceous Shark Teeth

    Cretodus crassidens from Eagle Ford Group. Cedar Hill, Texas.
  16. ThePhysicist

    Cretodus sp. Shark Teeth

    From the album: Post Oak Creek

    Some of the largest Cretaceous shark teeth you can find are from this genus. These are most likely C. crassidens.
  17. Just like the Western Interior Seaway needed any more large predators https://phys.org/news/2019-11-fossil-unexpected-discovery-million-year-old-shark.html
  18. doushantuo

    cretaceous,USA,Pisces

    A new large Late Cretaceous lamniform shark from North America, with comments on the taxonomy, paleoecology, and evolution of the genus Cretodus Kenshu Shimada &Michael J. Everhart Article: e1673399 | Received 30 Nov 2018, Accepted 09 Sep 2019, Published online: 18 Nov 2019 LINK (description of Cretodus houghtonorum n.sp) edit:5,30 MB,or thereabouts relevant: Philosophical Transactions of the Royal Society of London. Series B, Containing Papers of a Biological Character Vol. 210 (1921), pp. 311-407 V I I I .— On the Calcificati
  19. ThePhysicist

    post oak creek shark tooth

    Hey y'all, this is a shark tooth I found a couple months ago in post oak creek. I initially thought it was a cretodus, but now I'm having second thoughts. The 4th and 5th pictures are cretoxyrhina vraconensis and dwardius woodwardi, respectively. Thanks!
  20. It’s a been a while with a drought here in Texas. Got some big rain recently and this guy popped out. Eagle Ford/Atco 86-90 mya
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