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  1. Jaybot

    Cretoxyrhina mantelli

    From the album: Neutache Shoreline

    VM18 4/12/24

    © CC BY-NC

  2. Fullux


    These came from a Cretaceous site in Mississippi. One looks like it could be Scapanorhynchus and the other looks like Cretoxyrhina, am I correct?
  3. Mikrogeophagus

    Cretoxyrhina mantelli, Kamp Ranch

    From the album: Eagle Ford Group

    Cretoxyrhina mantelli, DFW Turonian, Cretaceous Apr, 2023
  4. Mikrogeophagus

    Cretoxyrhina mantelli, Arcadia Park

    From the album: Eagle Ford Group

    Cretoxyrhina mantelli, Denton Co. Turonian, Cretaceous Jan, 2023
  5. Mikrogeophagus

    Cretoxyrhina mantelli, Dessau

    From the album: Austin Chalk

    Cretoxyrhina mantelli, Travis Co. Santonian, Cretaceous Sept, 2022
  6. Mikrogeophagus

    Cretoxyrhina mantelli, Bouldin Flags

    From the album: Eagle Ford Group

    Cretoxyrhina mantelli, Travis Co. Cenomanian, Cretaceous Oct, 2022
  7. ThePhysicist

    Cretoxyrhina tooth

    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.
  8. SomethingIsFishy

    Kansas Shark Vertebrae/cartilage disk?

    I have recently found this fossil in north western Kansas (graham co.) I don't know if this is a shark vertebrae/cartilage disk or just a basic fish vertebrae. (Don't mind my bad prep work. I just started peeping fossils recently.)
  9. A couple of weeks ago, @Jackito, his son, and I took a trip out to one of his favorite Eagle Ford sites. For those of you who are familiar with Carter's posts, this was once the famed location of the so-called "giving rock", so the bar was set high for the day. I've come across some of Austin's eagle ford material in the past, but it was always only the leftovers of what had been washed through miles of rushing creek water. This was my first time getting to poke through the source material, so I was eager to see what could be found. The water was low and the temperature mild. I was thankful I wouldn't have to suffer trudging around in soggy shoes. As we walked beside the creek, Carter explained the various layers and where the best stuff could be found. He pointed out the notable spots where things like pseudomegachasma and pliosaur teeth had been dug up. I knew to not get my hopes THAT high up, but it was certainly a good motivator to stay attentive and expect the unexpectable. It took me a while to get the hang of pinpointing which slabs were best to open and how. Carter was nice enough to share some of his finds, and I must admit, not everything pictured below was necessarily first spotted by me . I was quickly surprised by the sheer number of shark teeth we started finding. Being the completionist that I am, I would immediately try to excavate every tooth I found. Carter advised me that simply bringing the matrix home and processing it there would be the most efficient use of time which I have come to agree with. Every tooth had fantastic preservation and would often pop right out of the shale (though not necessarily in one piece). The Ptychodus teeth were the most mesmerizing. They basically broke off without a speck of matrix still attached and had a beautiful shine. Thankfully, they were also robust and rarely fell apart. A decently sized Ptychodus still in matrix The amount of Cretoxyrhina to be found was also staggering. Unfortunately, they required a little bit more delicate prep than what I had to offer in the field, so my ratio of broken to unbroken teeth was higher than I'd like to admit. In my defense, I managed to lower that ratio as the day progressed. Squalicorax was also a common sight along with various fish teeth. Carter's son managed to find some turtle material... that was still alive and may or may not have come from out of the stream . For most of the hunt, Carter and I had some nice discussions on things to be found here in Austin along with various chats about life. The hours seemed to fly by so fast, it wasn't long until Carter and Jack had to head on out. They'd been wanting to find some mosasaur material for a while, so I sent info on one of my favorite sites (the place where I came out with 4 mosasaur verts in a day). Hopefully we'll get to hunt together over there some time in the near future. I stuck around as I had a couple hours to kill before needing to drive to a friend's birthday. The rest of the time was spent doing more of the same. I managed to come across a huge Cretodus tooth, but the root was unfortunately nowhere to be found. I also started gathering some of the leftover matrix for later processing for microfossils. The layer was just so rich, how could there not be something cool to find? I filled up a couple Ziploc bags with the stuff and made my way out, thinking of ways I could clean this while residing in a college dorm. The richness of fossils in the matrix. This piece was a little too stony to break down though. Might try vinegar. Suffice it to say, I figured out a way to clean it without clogging the communal sinks, but it's a slow process. Though, I must admit, it's nice to come home each day to a cup's worth of dried micro matrix ready for screening. In only my first batch, I found something I think is pretty amazing. What was at first just a shiny little speck, upon closer analyzing, may, in fact, be a tiny coniasaur tooth! It has that characteristic bulging crown that is instantly recognizable. Hopefully I'm not jumping the gun on this one. A couple rounds later, and many many puny Ptychodus teeth, I managed to spot what appeared to be the tooth plate to a Pycnodont fish or something similar. After some delicate cleaning and lots of paraloid, it's still a little bit scuffed, but there are definitely some little round bulbous teeth in close association. The tooth plate before and after cleaning. Can anyone confirm if it's Pycnodont? There was plenty bony fish and shark material. Interspersed within them were some that eluded my identification (including mayyybe Paraisurus?). I've got plenty of matrix to still go through, so I will post updates if anything cool is found. For now, here are some pictures summarizing the finds: Please excuse the hand pics. It's just that the details come out better on a slightly darker surface as opposed to white paper. Closeups of Coniasaur(?) Tooth L to R: Bony bits, "Coniasaur" tooth, and "Pycnodont" tooth plate The best of the Ptychodus and a close up of the smallest one. The bottom left is smoothed over. Is this maybe feeding damage? Also, any ID for species is much appreciated : Cretoxyrhina mantelli. My favorite is the fat one on the left Best of the Squalicorax falcatus. Right two are a little strange. Possibly symphyseal? Best of Scapanorhynchus and huge rootless Cretodus (hard to see in pic, but its got the wrinkling): Paraisurus? I saw that genus mentioned in a Shawn Hamm publication on the Atco and thought it could be a match. The roots are very skinny on both specimens and the teeth seem vertically stretched. The larger tooth on the left initially appears to be missing half the root, but it is actually nearly complete. The only break is a tiny portion of the root at the very top. The right specimen is very fragmented. No signs of cusps nor nutrient groove on either one. Cantioscyllium orals and Sawfish Rostral Teeth: L to R: Enchodus, Protosphyraena, and Pachyrhizodus Some oddballs. The left is a fragment of some sort of multi-cusped shark tooth. The middle is a a segment of some barbed material that seems similar in appearance to the fishy bits found in the matrix. The right specimen is a shiny crescent shaped thing that I have found in other micro matrixes from Moss Creek and POC. Never kept them, but now I'm curious after finding them again: Thanks for reading!
  10. Fatigued_Fossil_Hunter

    Cretaceous shark teeth I found in Grayson County, TX

    Eagle Ford Group, Post Oak Creek, Sherman, TX, USA I'm curious to know the identity of these shark teeth so help from experienced fossil hunters would be much appreciated!
  11. ThePhysicist

    Cretoxyrhina tooth (3)

    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!
  12. ThePhysicist

    Cretoxyrhina tooth (2)

    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!
  13. ThePhysicist

    Cretoxyrhina tooth

    From the album: Sharks

    One of my favorites - the "ginsu" shark. This one was found at the DFW airport in the 80's.
  14. ThePhysicist

    Cretoxyrhina mantelli (6)

    From the album: Sharks

    Nearly flawless lateral "ginsu" from the Smoky Hill Chalk of Kansas, USA.
  15. ThePhysicist

    Cretoxyrhina mantelli (4)

    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.
  16. ThePhysicist

    Cretoxyrhina mantelli (5)

    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.
  17. ThePhysicist

    Cretoxyrhina Tooth

    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.
  18. ThePhysicist

    C. mantelli tooth damage

    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.
  19. Untitled

    Cretoxyrhina mantelli Mississippi

    From the album: Cretaceous Shark Teeth

    Cretoxyrhina mantelli from Monroe County, Mississippi.
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