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Showing results for tags 'niobrara formation'.
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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
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! -
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! -
Hi everyone, I just ordered this beautiful vertebra found in the Niobrara Chalk of Kansas (Cretaceous, 87 - 82 mya) for quite a bargain. Unfortunalty I don't have any precise location as where it was found, for that I am going to contact the seller. The vertebra was listed as being Mosasaur which it could very well be, but since it is a little bit distorted I am not quite sure, especially since many other critters can be found in the Niobrara Chalk. So I was hoping on the expertise of some of our members here who have more knowledge of Cretaceous verts and of Kansas fossils. @KansasFossilHunter @Troodon @LordTrilobite @pachy-pleuro-whatnot-odon @The Amateur Paleontologist you guys might be able to shed some more light on the piece? Thank you in advance! Topic might be more usefull with some pics, so here they are.
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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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- c(n)cm2
- cretaceous
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From the album: Sharks
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- cretoxyrhina mantelli
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From the album: Sharks
Closeup of a C. mantelli tooth with unusual wear. I suspect it could be from a tooth in the opposing jaw, or that it may have been bitten in the process of falling out of the mouth during feeding.-
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- cretoxyrhina mantelli
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Hello, I've put teeth here for Id a couple of times and always received a satisfactory answer. I hope you can help me this time too. It is about this Ceratopsidae tooth from the Niobrara Formationn (Wyoming). Unfortunately no fossils of this group are known from this formation and I therefore wanted to ask you if you have any idea what species of dinosaurs the tooth could belong to. The tooth is 1,5cm in size. I hope if you can help me with this! Best regards from Germany!
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- campanian
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Found this here in western Colorado I have done some looking online closest thing i can find is fossil/petrified palm wood it would be from the Niobrara Formation, Smoky Hill Member and is Upper/Late Cretaceous. What do you guys think? Did a quick polish too quick as you can see all the scratches haha Thanks anyone that can help
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Greetings, I am an amateur fossil collector and rock hound and I don’t know too much about fossil species or how to identify them... My dad recently gave me some of his shark teeth he found in the 90s at his coworkers ranch. He never bothered to identify them so I’m hoping to get some help with that, thank you! He showed me the area on a map and told me about the rock types and I’ve come to the conclusion that they were found somewhere in between the Carlisle shale and the Niobrara Formation, though I could be mistaken. The area he found them at is southeast of Colorado Springs on private land. I will post pictures below, help of any kind is appreciated!
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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
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- cretaceous
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Hi everyone. I recently bought this Mosasaur fossil that was labeled as a Tylosaurus Humerus, and i just wanted to check if this is indeed a humerus or another part of a mosasaur because looking at some pictures on the internet of mosasaurs (and Tylosaurs) it could also be a radius. It is 5 and a half inches in length and was collected in the Niobrara Formation in the Smoky Hill Chalk (Kansas). Since i am not an expert on mosasaurs (i am still learning about them) and my knowledge is limited, i was hoping someone who knows about mosasaurs could help out in confirming if this does belong to a Tylosaurus and if it is a humerus or a different part. I do trust the seller i just thought it would be worth posting on the forum to see what others think. Any help would be greatly appreciated.
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I prepped another Niobrara coprolite and found an interesting inclusion. With my limited knowledge of fish anatomy, My best guess is some kind of connecting bone where the vertebrae meet the skull? The coprolite contains both large and small fish vertebrae in addition to this bone. Thanks in advance for your help!
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@Ramo was kind enough to send me some Niobrara coprolites to study. I decided to prep out a bone inclusion that was visible on the surface. I'm not a fish expert, so I'm guessing a preopercular fragment? Thanks for looking!
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