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Does anyone have a good picture of an onchosaurus oral tooth? Thanks!

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 over, it is totally smooth. Any ideas?

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?

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?

Apparently, two of my posts from yesterday didn't go through. So here is Take 2. It is a very small tooth as you can see. It almost resembles a small pebble, but the crown is definitely enamel. A person on the Cretaceous Shark and Marine Life group on Facebook suggested Brachyrhizodus ellipsis. Is there any concurrence here?

Day two of posts. I am posting four more fossils that I need help with. The first is a fragment. It looks like the tooth broke off right before the main cusp. There are two accessory cusps, the larger one looks like it has striations. This caused me to think of Cretodus semiplicatus. However, according to Welton, this shark only has one set of accessory cusps, never two. So any ideas?

The final tooth of today is problematic in that it is a fragment. The main cusp seems to be complete, but that is all I can offer. Any help with this one? More to come tomorrow.

My first thought of the third tooth of today is some kind of orectolobid. But what kind? The cruciform shape is kind of strange. What I am assuming to be the mesial face contains a bulbous protrusion, and the distal face has a concavity in which the following tooth would fit. Any ideas?

The second tooth of today, at first glance, looks pycnodontid. But in the hundreds of pycnodont teeth I have found, I have never seen this type of ornamentation. And the root (as worn as it is) is definitely not that of a pycnodont. Any ideas?

This is the other post that I was not able to find on the Forum (I'm sorry if I am just not finding it) This seems to be an odontaspid of some kind, but it is exceedingly small. Any ideas? I will be posting four more unknowns later today

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 first one has an extremely close accessory cusp. A pathological tooth?

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 is somewhat like a cretolamnid, but is very small. An extreme cretolamnid lateral tooth?

I'm hoping someone will have a pdf of some fossil shark papers by Gerald Case. I'm finding that many of his papers are in journals that my university does not have a subscription to. In particular I am trying to identify sharks/rays/fish that I picked from a bucket of Bashi Formation matrix (early Eocene) so the first paper is most useful to me. However there are others that cover other sites I have collected so I'll go for broke and hope someone has some of these they are willing to share. Case, G. R. 1994. Fossil fish remains from the late Paleocene Tuscahoma and early Eocene Bashi Formations of Meridian, Lauderdale County, Mississippi. Palaeontographica Abteilung A, 230:97-138. CAPPETTA, H. & CASE, G.R. (2016)A Selachian Fauna from the Middle Eocene (Lutetian, Lisbon Formation) of Andalusia, Covington County, Alabama, USA. Palaeontographica, Abt. A, 307 (1–6): 43 – 103 CASE, G.R. & BORODIN, P.D. (2000)Late Eocene selachians from Irwinton Sand Member of the Barnwell Formation (Jacksonian), WKA mines, Gordon, Wilkinson Country, Georgia. Münchner Geowissenschaftliche Abhandlungen, (A), 39: 5–16, 5 pl., 3 fig., 1 tabl. CASE, G.R. & BORODIN, P.D. (2000)A Middle Eocene Selachian Fauna from the Castle Hayne Limestone Formation of Duplin County, North Carolina. Münchner Geowissenschaftliche Abhandlungen, (A), 39: 17–32, 7 pl., 1 fig. CASE, G.R. (1987)Borodinopristis schwimmeri, a new ganopristine sawfish from the Upper Blufftown Formation (Campanian) of the Upper Cretaceous of Georgia. Bulletin of the New Jersey Academy of Sciences, 32 (1): 25–33, 6 fig. Thanks! Don