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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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I've recently become very interested in the sharks of the Cretaceous. The largest of all sharks during this time period was supposedly Cretoxyrhina mantelli, or the "Ginsu Shark". It likely would've highly resembled the modern Great White. I looked up a few images of their teeth, but I was wondering if anyone who hunts the Cretaceous here on the forum has any of their own? If so, I'd love to see them! Hoppe hunting!
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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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I kayaked for five miles on a day with a heat index of 108 degs and found some killer stuff. The Paleo Dalton point made my day. Rare to find mosasaur in this creek but I still managed to find a few verts. The big nautilus was beat up but looks good in my rock garden. The old bottle is a duraglas bottle from 1953.
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Cretoxyrhina and Squalicorax (Ginsu and Crony) drawing
Macrophyseter posted a topic in Paleo Re-creations
After stuffing my face into tons of scientific articles on Late Cretaceous Lamniformes, I decided that I'd want to draw some sharks. Here's a drawing of the two infamous sharks of the Niobrara Formation Cretoxyrhina mantelli and Squalicorax falcatus as partners-in-crime. I've made the Cretoxyrhina ≈6-7 meters and the Squalicorax ≈2 meters. As 2 meters would be the same size as a very tall 6'6" human, you could imagine the Squalicorax as the tallest ordinary human and see how much bigger Cretoxyrhina is. I've always felt like Squalicorax would commonly accompany predators like Cretoxyrhina to "help" strip bare the latter's kill (Crow sharks are indeed inferred by scientists as opportunistic feeders or scavengers), almost as if Ginsus had them as little cronies. Also, the common name Crow Shark sounds somewhat similar to crony. Now what if we started a new nickname for Squalicorax as a crony? That would be hilarious and maybe realistic. EXTRAS- 12 replies
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Here's a few of my finds from my last couple of Northeast Texas creek hunts. It's been pretty slow but I'm trying again tomorrow. I did find a killer Ginsu shark tooth and cool fish vert with partial process. I didn't know what the little penny trinket thing was until an older gentleman told me lol. The one vert with four pics is Pleistocene but I have no clue from what. We did find a large nest of cottonmouths where two males were fighting for a large female. We saw herds of wild hogs and had quite the kayak adventure. One kayak trip was 5 miles deep in the woods where we had to go over 7 log piles with the kayaks. I'm also unsure what the little white tooth is with multiple pics by the trinket. It has thick enamel whatever it is. Hope you enjoy the pics.