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  1. readinghiker

    Help on this unknown lamniform?

    Hopefully, this will be the last time I post on this fauna until I announce the finished publication! I had originally identified this as a cretodus, but after reviewing Everhart and Welton, I am having very serious doubts as to the validity of this ID. The teeth are both labially and lingually striated. The lingual striations look totally different than the pattern found on the scapanorhynchids. The teeth have accessory cusplets, sometimes two on a side. The base of the teeth are more robust than that of scapanorhynchids, too. As you can tell by the photos, even the w
  2. readinghiker

    Cretodus cf. semiplicatus?

    Hey all! I have this tooth that appears to be a cretodus. It has plications on both the labial and lingual faces, with the lingual plications being smaller than the labial. Cretodus so far. Iy measures 3.88 mm in height and 3.42 mm mesio-distally, The problem arises with the accessory cusps. Welton and Farish state that Cretodus semiplicatus only has one accessory cusp on each side of the main cusp. Although one side of the cusps is missing, the other side obviously has two cusps. Was Welton and Farish mistaken, or is this tooth not even cretodus? Thanks! Randy
  3. readinghiker


    This has me stumped! An orectolobid, but what? I am assuming it is a cantioscyllium, but it doesn't have the cusps that most fish of this genus have. Unlike C. decipiens, there are no strong striations. Instead, there are some small ones on the labial edge, and the lingual edge has a kind of rim. Also, there is one small transverse striae found on either side of the mesial ridge. Any ideas? There are four teeth discovered in this fauna, so they can't be pathological. Thanks!
  4. readinghiker

    Strange ptychotrygon

    I'm coming to the experts once again! This is a very strange ptychotrygon tooth. It appears to be P. triangularis, but it is so elliptical. The low crown is similar to some of Bourdon's P. eutawensis, but according to Woodward's original description, there is a bit of ornamentation on the labial apron, which this doesn't have. Could this simply be a pathological tooth? Thanks!
  5. A couple of questions concerning these fish. Are all nursallia teeth characterized by the eight or so bumps on one side of the tooth? Did pycnodonts regularly shed their teeth? Most of the teeth I have found are hollowed out basally, which makes me think that they were shed, I have a few that look like they have remnants of jaw fragments attached, which makes me think that these teeth belonged in the mouth of a fish that had died. How do you tell the difference between pycnodontid and lepidotid teeth? Thanks!
  6. I am right now out in the field, attempting to extract a string of articulated reptile vertebrae in the lower Atco. It is in a soft marl bed just a few feet above the basal Atco. There seems to be articulated ribs associated with the specimen, and so far I have uncovered 14 verts. 9 of them were lose of the surface and bagged in ziplocks, but now I am trying to get the rest out. If anyone has any advice, I need it! The specimen also has articulated ribs. I want to get this thing home tonight, and not destroyed. This is is my first time attempting to extract vertebrae, and I want to
  7. Barrelcactusaddict

    Kuji Amber (Tamagawa Fm., ~91.05-85.2 Ma)

    From the album: Fossil Amber and Copal: Worldwide Localities

    “Kuji Amber” Hirono, Iwate Prefecture, Japan Tamagawa Fm. (Kuji Group) ~91.05-85.2 Ma Total Weight: 1.3g Longest Specimen: 10mm Lighting: Longwave UV Entry five of ten, detailing various rare ambers from European, Asian, and North American localities. Studies on this amber, and Japanese ambers in general, are especially fascinating from a pharmaceutical point of view. In early 2012, a particular diterpenoid was extracted from Kuji amber that has been shown to possess powerful anti-allerge

    © Kaegen Lau

  8. Barrelcactusaddict

    Kuji Amber (Tamagawa Fm., ~91.05-85.2 Ma)

    From the album: Fossil Amber and Copal: Worldwide Localities

    “Kuji Amber” Hirono, Iwate Prefecture, Japan Tamagawa Fm. (Kuji Group) ~91.05-85.2 Ma Total Weight: 1.3g Longest Specimen: 10mm Lighting: 140lm LED Entry five of ten, detailing various rare ambers from European, Asian, and North American localities. Studies on this amber, and Japanese ambers in general,

    © Kaegen Lau

  9. Hello forum members! With the new Coronavirus raging across the world, I thought it would be nice to start some kind of advent calendar, using my own Squalicorax collection. Everyday I will post one or multiple Squalicorax teeth from one location. Let's see what ends sooner, my collection or the virus outbreak. I will start with the oldest tooth from the Albian substage and end with the teeth from the uppermost substage; the Maastrichtian. The first one is the oldest and also one of the smallest teeth in my collection. Unfortunately it is so sma
  10. Heteromorph

    Coniacian Glyptoxoceras?

    Is anyone aware of any Glyptoxoceras sp. in the Coniacian? @doushantuo, I know that you are good at digging up information like this. Can you find anything?
  11. readinghiker


    Going through some scapanorhynchus teeth to photograph for a museum bulletin I'm working on, I came across this tooth. It is different in that there seems to be at least one striation on the labial face. The striations on the lingual face are pretty distinct, but seem to be worn (depositional wear?). Could the labial striation also be depositional wear? But the really odd thing is the pair of cusplets. Scapanorhynchus raphiodon and Scapanorhynchus puercoensis are both found within 25 miles of this site, but the cusplets on these species are smaller in relation to the
  12. readinghiker

    Unknown Schlerorhynchid from New Mexico

    Hey all, I am having a heck of a time trying to identify this tooth. Both Shimada and Kirkland suggest that it is a schlerorhynchid, but I have not found anything in the literature that resembles this morphology. The shoulders of the tooth are slightly oriented labially, the apical cusp is rounded (due to deposition or weathering? If so, why is the keel still so pronounced?), there are no transverse ridges, there is a fairly large lingual uvula, and there is a single arched lingual ridge on each shoulder. This one has me stumped! Any and all help will be greatly appreciated!
  13. readinghiker

    Orectolobiformes resources?

    Hey all, does anyone know of a good source of information for the identification of orectolobiformes? Or someone I could contact concerning these sharks? I have five teeth that most likely belong to different species, but have been having a hard time with their IDs. I am going through Cappetta's 2012 handbook, have gone through Welton and Farish, and looked up orectolobiformes on the Fossil Forum, to no avail. I will most likely be posting pictures later today or tomorrow. Thanks!
  14. readinghiker

    Unknown Coniacian teleost?

    These tiny teeth (?) have me stumped, as did a bit of the Cabezon fauna I am working on. This site has been very helpful in identifying some of the rarer fossils, and I am asking for your help once again. At first glance, I thought these four dots were fungal or some other type of current plant material, but examining them under a microscope I am pretty convinced these have enameloid structures. Any idea of what they could be from? I am assuming some form of teleost at this time. Thanks for all of the help, past, present, and future!
  15. readinghiker

    Unknown teleost (?)

    Hey all! This small jaw fragment was in the thousands of fossils pulled out of anthills. I am assuming it is a teleost. Other than several species of sharks, rays, and sawfish, there are pycnodonts, enchodus, and Protosphyraena. This looks like nothing I've found yet. Any ideas?
  16. readinghiker

    Unknown lamniform

    Hello all! I have around a dozen of these teeth. (Found in New Mexico. Coniacian.) The very prominent lingual protuberance should be diagnostic, but I can't find a match. Eostriatolamia tenuiplicatus looks good, but the crown has striations, and these don't. Archaeolamna kopingensis also looked good, but the secondary cusps of this species are oriented away from the main cusp. Leptostyrax macrorhiza also has labial striations. The narrowness of the cusps and crown also has me baffled. Any ideas?
  17. Found close to Paderborn, Germany (Erwitte-Formation) alongside with some echinoids (most likely Micraster cortestudinarium),an ammonite and countless Inoceramidae clams. Marly Limestone Formation of the lower Coniacium or upper Turonium. I was wondering if it could be some kind of petrified drift wood, palm or root?
  18. Good day, all! Can anyone tell me the differences between Myledaphus and Pseudohypolophus? All responses will be greatly appreciated!
  19. readinghiker

    Unknown ray

    Here is another Cabezon taxa that I am having a hard time identifying. Is it Pseudohypolophus? Rhombodus? Myladephus? Something else? Any help will be greatly appreciated! Randy
  20. readinghiker

    Cretodus cf. semiplicatus?

    This is a well worn tooth from the Cabezon fauna. With the lingual and labial plications, I am assuming this is a Cretodus. The narrow cusp leads me towards C. semiplicatus. However, the accessory cusp is not as triangular as I would expect to see from this species. Am I right in my assumption concerning the species, or am I off base? Thanks!
  21. readinghiker

    Ischyrhiza mira?

    Hey everyone, I am trying to identify this tooth. My first guess would be an Ischyrhiza mira oral tooth, since I have a rostral tooth from the same site. But it also looks somewhat like the proposed Onchosaurus oral tooth as illustrated in Bourdon, et. al. (2011) page 39 tooth D. Or I could be completely off and it is some kind of orectolobid. What say you?

    Early Coniacian Tooth ID Help

    I found this in Central Texas Basal Atco Conglomerate with Ptychodus latissimus and Ptychodus atcoensis. It is only about 15 mm to 20 mm tall, including a partially bilobed (?) root and worn tooth crown. Any ideas? Fish or squamate?
  23. Hello all! I have finally finished sorting close to 300 pounds of anthill from north central New Mexico. I recovered (literally) close to 18,000 fossils! Most are identifiable, but there are a few that I can't put a name to. I am going to put up several for your expert analysis (not being facetious, you guys have an enormous amount of knowledge!) to see what you have to say. I will repeat this introduction for each grouping of photos, only changing the take number. Thank you all in advance! This fossil shows the internal structure that I normally see in Ptychodus. But when I flip it ove
  24. The first is a strange tooth whose crown extends far into the root. As you can see on the photos, there is a bulge at the bottom of the crown, and that the root extends up the sides of the crown quite a ways. Any ideas?
  25. This final fossil could very well be a dermal denticle. However, if it is, it is the most robust denticle that I have seen. It is quite large for a denticle as well. Any other possibilities?
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