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From the album: Texas Cenomanian (Cretaceous)
Cretoxyrhina mantelli Cenomanian Texas- 1 comment
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Identification Cretoxyrhina teeth are simple in design, having a triangular crown with smooth enamel and non-serrate edges, a thin lingual dental band, rounded root lobes, a lingual root protuberance, and no nutrient groove.1,2 Comments This tooth is from a latero-posterior position, given the crown's distal curvature. The chalk preserved this tooth very well - the enamel retains a sharp gloss comparable to that on modern sharks' teeth. References 1. Bourdon, Jim, and Michael J. Everhart. “Analysis of an Associated Cretoxyrhina Mantelli Dentition from the Late Cretaceous (Smoky Hill Chalk, Late Coniacian) of Western Kansas.” Transactions of the Kansas Academy of Science (1903-), vol. 114, no. 1/2, 2011, pp. 15–32. JSTOR, http://www.jstor.org/stable/41309622. 2. Shimada, Kenshu. “Dentition of the Late Cretaceous Lamniform Shark, Cretoxyrhina Mantelli, from the Niobrara Chalk of Kansas.” Journal of Vertebrate Paleontology, vol. 17, no. 2, 1997, pp. 269–79. JSTOR, http://www.jstor.org/stable/4523806.
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From the album: Sharks
Just a handful of Cretaceous species, most from North Texas. The sea that bisected North America ~85 million years ago played host to a diverse and burgeoning ecosystem that supported many species of sharks. It was likely due to specialization that allowed these sharks to all live in the same place and time.-
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From the album: Sharks
A gorgeous tooth from one of my favorite sharks! The enamel isn't polished - the chalk preserves its shine extremely well - it's as shiny as when it fell out of the animal's mouth!-
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From the album: Sharks
A beautiful tooth from one of my favorite sharks. This one is extra special because of the self-inflicted bite mark - a gash seen on the left in lingual view. Apparently their bite was strong enough to cut their own teeth!-
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From the album: Sharks
One of my favorites - the "ginsu" shark. This one was found at the DFW airport in the 80's.-
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From the album: Sharks
Nearly flawless lateral "ginsu" from the Smoky Hill Chalk of Kansas, USA.- 1 comment
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From the album: Sharks
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From the album: Post Oak Creek
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From the album: Sharks
Cretoxyrhina mantelli Ginsu shark Niobrara Fm., Gove Co., KS (leftmost 2 teeth) Eagle Ford Group, Sherman, TX (largest tooth) Eagle Ford Group, Dallas, TX (rightmost 2 teeth) A collection of teeth from a formidable Late Cretaceous lamniform shark. This species competed with other sharks and marine reptiles in the Western Interior Seaway ~ 90 Ma. It likely filled a similar niche that the Great White Shark does today. The ginsu was on average larger than the Great White. Oh, it also ate dinosaurs.-
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From the album: Sharks
Cretoxyrhina mantelli Ginsu shark Eagle Ford Group, Dallas, TX Found at the DFW airport in the 80's, this anterior tooth shows some nice coloration.-
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Hi everyone! I went to Post Oak Creek, Texas a few weeks ago and got a decent haul. Including three teeth that I think are from some rare species that I wanted to confirm my id on. I think the first two are Cretoxyrhina mantelii and the third is Protolamna. I'm particularly unsure with the second one since it seems to have a slight nutrient groove. The first one also has damage where there would have been cusps so I'm not sure if it's a different Cretoxyrhina species or a different genus entirely. I'm fairly certain the creek is Atco formation. I know it's either Turonian or Coniacian
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Identification: ginsu teeth have broad lingual dental bands, rounded root lobes, a strong lingual protuberance in the roots of anterior teeth, smooth crown faces, and no nutrient groove. Notes: Has damage on the lingual side, perhaps a self-inflicted gash as the tooth fell out of the mouth. Otherwise, a perfect tooth with a very sharp point.
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From the album: Sharks
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From the album: Sharks
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From the album: Sharks
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I've always been fascinated by the Cretaceous sea and its myriad of terrifying carnivores, many that would've made Jaws look meek. After watching BBC's Sea Monsters, I made it my goal to compile a box of sea monster fossils. I started this journey 10 years ago, and finally completed the box recently. Allow me to present my Predators of the Cretaceous Sea collection, and take you on a journey to the most dangerous sea of all times. The box measures 20.25 inches long. Inside are 24 unique predator fossils. I will introduce them from left to right, top to bottom: Rhombodus binkhorsti Age: 70.6 - 66 mya | late Cretaceous Formation: Severn Formation Locality: Bowie, Maryland, USA Size: 1 meters Diet: Molluscs and crustaceans art by Nobu Tamura --------------- Polyptychodon interruptus Age: 105.3 - 94.3 mya | Cretaceous Formation: Stoilensky Quarry stratigraphic unit Locality: Stary-Oskol, Belgorod Oblast, Russia Size: Maybe 7 meters (This is a tooth taxon so size is not confirmed) Diet: Anything it could catch Note: If you consider Polytychodon a nomen dubium, then this is a Pliosauridae indet. art by Mark Witton ----------------- Prognathodon giganteus Age: 70.6 - 66 mya | late Cretaceous Formation: Ouled Abdoun Basin Locality: Khouribga Phosphate Deposits, Morocco Size: 10-14 meters Diet: Everything art by SYSTEM(ZBrushCentral) --------------- Coloborhynchinae indet. Age: 99.7 - 94.3 mya | late Cretaceous Formation: Kem Kem Beds Locality: Southeast Morocco Size: 7 meters (high estimate) Diet: Fish and cephalopods
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From the album: Cretaceous Shark Teeth
Cretoxyrhina mantelli from Monroe County, Mississippi.-
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From the album: Cretaceous Shark Teeth
Cretoxyrhina mantelli from Monroe County, Mississippi.-
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From the album: Cretaceous Shark Teeth
Mississippi Ginsu shark tooth w/ cusplets.-
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From the album: Cretaceous Shark Teeth
Mississippi Ginsu shark tooth w/ cusplets.-
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From the album: Cenomanian Shark Teeth and other Marine Fauna, Ryazan Oblast, Russia
Cretoxyrhina vraconensis (Zhelezko 2000). Slant length indicated by longest side.-
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From the album: Cretaceous Shark Teeth
Eagle Ford Group Cretoxyrhina from Texas.-
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From the album: Cretaceous Shark Teeth
Eagle Ford Group Cretoxyrhina from Texas.-
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From the album: Cenomanian Shark Teeth, Tambov Oblast, Russia
Cretoxyrhina vraconensis (Zhelezko 2000). Slant length indicated by longest side.-
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