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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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About a week ago, I was visiting relatives in Western Kansas and was taken to a very small exposure of Upper Niobrara chalk on the family farm. I have been hunting in the area for many years and I had never paid any attention to this particular location. I did not see much material that was worth picking up, BUT then..the unusual texture of this particular "stone" caught my eye. Because the exposure consisted of a few feet of the Upper chalk covered by a thin veneer of sand and gravel (Ogallala?) and then the top soil, I am not at all certain of the geologic age of this specimen. The relative absence of wear does not suggest that it was transported with the sand & gravel, BUT I have NEVER heard of any fossil sponges (or coral for that matter) from the Smoky Hill Chalk. I would VERY much appreciate your suggestions as to the age & identity of this find. Dave
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TFF, After about 10 months, I am finally scheduling myself to make another trip to western Kansas next week - 8/27-8/30. I am conducting field work for my master's thesis which focuses on outcrop modeling and interpretation of Niobrara fracture systems using a drone. I feel fortunate that one of my field areas is famous for its abundance of preserved Cretaceous fauna. While I'm out there, I figured I would try to make an effort to visit some well-known fossil localities that have public access or find private landowners that are also enthusiastic about fossils. Previously, I was lucky enough to find a near-complete Cimolichthyes jaw and some other large fish vertebrae. I know I can re-visit that same site in an effort to find other fossils but I thought I would reach out to Kansas veterans to see if anyone else has suggestions of locations to visit. From reading some of the other threads, it sounds like Castle Rock is a fairly popular destination for public hunting, but I have a feeling after all these decades that there might be other spots that have been less picked-over. I'm looking to find anything and everything but would especially like to find a few teeth. I have relatively little diversity in my current fossil collection. Thanks in advance for your help and guidance!
