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  1. Dino Dad 81

    Chunkosaurus from Lance

    Hi All, Curious to know if this hunk of chunkasaurus from Weston county Lance formation can be place in a family. Also, I marked a set of holes along the top to see if you think they could be tooth marks.
  2. Dino Dad 81

    Fascinating coprolite or egg?

    It's hard to capture the beauty of this thing in pictures. Could it be an egg? Just a fascinating coprolite that shows its contents?
  3. Dino Dad 81


    This thing looks pretty bizarre. It's very dense, and has no tongue-sticking, so I think it's just a strange looking, bad-tasting rock. Every time my son or I tried to see if there was any tongue-sticking on the small black section, we were running to the kitchen to wash our mouths out--very sour, metallic taste. I'm worried we tasted dino poop. Or is this just some rock that should have stayed in the ground?
  4. Dino Dad 81

    Chunkosaurus from Lance

    Hi all, My son and I recently got the incredible opportunity to live the dream and break into rocks from the Lance formation in Wyoming ourselves in the comfort of our own living room--thanks to a special member on TFF ! We came across this Chunkosaurus piece last night. If there's enough material here to ID (even just the family it comes from), we'd be thrilled to hear your thoughts. In my novice eyes, it looks like it may be a chunk from the perimeter of a Triceratops frill. One typically expects to see the curvature at the perimeter of the frill having the opposite o
  5. WyomingRocks!

    'Twisted' Claw Help needed - Lance Fmtn

    Hello, here is a new type of claw for me. I found it a couple days ago in a Lance Fmtn site I have in Wyoming. This claw is 1" long. It has an unusual 'twist' to it in that the left side drops down if you are looking at the point view. Almost like it is 'torqued'. Please let me know if you have any info. Is it turtle, crocodile, or dinosaur related? Thx!
  6. Nanotyrannus35

    Possible Partial Triceratops Horn?

    I'd gotten some more lance fm matrix and had found this. It had at first looked like a rib fragment but it has this weird texture on the bottom and the sides. Just wondering what you guys think. Thanks for any help. It's from the Lance Fm of Weston Co. Wyoming.
  7. ThePhysicist

    Meniscoessus tooth

    From the album: Hell Creek / Lance Formations

    Meniscoessus was a large multituberculate mammal (large by Cretaceous standards), identified by the crescent-shaped/grooved cusps. Looks like a right M2 (right 2nd lower molar).
  8. ThePhysicist

    T. rex tooth chunk

    From the album: Hell Creek / Lance Formations

    For most collectors, it's more affordable to have a piece of a T. rex tooth if you just want it represented. This one is clearly T. rex: it's theropod with serrations (this one has the basalmost portion of the mesial carina), very thick, and clearly would've had a large circumference. Note also the large angle made by the curvature of the tooth at the carina (not Nanotyrannus which have narrow, blade-like teeth).
  9. I'd found this bone in some lance fm matrix. It's straight and has a weird blob at the end, so it's kind of matchstick shaped. Was thinking it could be a fibula or an ulna. Thanks for any help.
  10. Nanotyrannus35

    Weird Lance fm piece of bone

    I'd found this bone looking thing in some lance fm matrix. I can tell it's bone because the bottom has the bone texture. It seems to maybe be trike frill, ankylosaur osteoderm, or something pachy. Location is weston county, WY. It's about an inch long. Thanks for any help.
  11. Seanrad09

    Another Lance Fossil

    Got another one than has me stumped from the Lance in Wyoming… any ideas guys? Thanks!
  12. Nanotyrannus35

    Possible Theropod Tooth?

    I'd found this partial tooth from the lance formation and was wondering if it would be identifiable. It's pretty partial so I wouldn't be surprised if it's unidentifiable. Here are the pictures The side The front The top And the bottom Thanks for any help.
  13. Nanotyrannus35

    2 Lance fm Vertebral Arches

    I have found 2 vertebral arches in my box of matrix from the lance fm. I was wondering if it is possible to identify the arches without the centrums. Here are the pictures, the fossils are from weston county, wyoming Vertebral Arch 1 And vertebral arch 2 Thanks for any help!
  14. Nanotyrannus35

    Lance Formation Vertebra

    I had found this vertebra in the box of matrix I'd gotten for my birthday. I think that it might be either a crocodile or a Pachycephalosaurus caudal vertebra, I was hoping that you guys might be able to identify it. It was found in the Lance formation of Weston County, Wyoming. Here are the pictures. Scale is in millimeters. Thanks for any help!
  15. So what is the difference between the lance fm and the hell creek fm? They both have the same dinosaur species and from what I can tell, other vertebrate species. The only difference that I can think of is that the lance fm is in Wyoming while the hell creek fm is in South Dakota, Montana, and North Dakota.
  16. Nanotyrannus35

    Richardoestesia Tooth?

    I'd found this partial tooth in some lance fm matrix. It doesn't look like crocodile so I think that it might be Richardoestesia. Here are the pictures. It's about a half inch long.
  17. Hey everybody! I wanted to make a thread sharing with you some of the smaller fossils in my collection, many of which I've photographed using my digital microscope. Some of these I've found in the field at microsites or channel deposits, while others I've found at home searching through matrix. I hope you enjoy! Our journey begins in Wyoming's Lance formation: A Pectinodon tooth my dad found in 2017. A tooth that was identified by other forum members as potentially Avisaurus, also found in 2017. A tooth I initially called Paronychodon, although the small &
  18. Nanotyrannus35

    Lance Formation Dinosaur Bones ID

    For Christmas, I'd gotten a box of matrix from the Lance formation. I have some fossils that I am not sure what they are and would like to get your opinions. All of these fossils are from the Lance formation of Weston Co. WY. The first one is I think a theropod ungual, missing both the distal and proximal ends. Here are the pictures. The second one I'm pretty sure is a partial Edmontosaurus metacarpal. The The third one might be a ornithischian ungual. And here is the final one, I think that it might be a jaw section.
  19. Why are there so many late Cretaceous dinosaur fossil bearing formations in the western usa? In just Montana alone, there is the Hell Creek fm, the Lance fm, the Judith River fm and the Two Medicine fm. The fauna in these different formations are also similar, it's kind of confusing.
  20. Seanrad09

    Lance Form. find, ceratopsian?

    Found this three years back in the Lance Formation. About 50 miles out of Newcastle, WY on a dig trip. Going through some bones I haven’t tried to ID. Any suggestions on this one? It has nice bone surface in a few spots, but isn’t familiar to me.
  21. PaleoNoel

    Parasaniwa Tooth

    Happy New Year everyone. Tonight I thought I might post a fossil whose identity I wanted to confirm. I found it in Wyoming's Lance formation this summer and someone told me it might be a Pachycephalosaur premaxillary tooth because of it's carinae and ridges at the base. However after comparing my tooth to examples I could find online I felt that this ID was incorrect. Eventually I looked back over one of @Troodon's threads and found a jaw labelled as parasaniwa and those teeth matched what I had found. My tooth is about 6 mm long and about 3 mm wide.
  22. M Harvey

    turtle marginal?

    I came upon this bone while sorting my old boxes. It looks like the dorsal edge of a turtle marginal. I say this because of the slit on the inner surface resembles the split marginals make. It is the surface pattern that puzzles me. I am unfamiliar with the freshwater turtles from this area and hoping someone can identify this.
  23. DatFossilBoy

    Juvenile Trex tooth?

    Hey guys, I saw this Tyrannosaurid tooth from the Lance creek formation, USA. I was wondering if it was a juvenile T. rex tooth. It’s 0,5 inches long. Thanks for the imput
  24. FF7_Yuffie

    Lance formation tooth question

    Hello, anyone able to help with this one? Going through my old "fossil" folder, I found this one I got 10 years ago bought as "Albertosaurus" from Lance Formation. Now, looking online I'm seeing Albertosaurus as not being from Lance. Indeed, only valid Tyrannosaur from there is looking like Rex Would this be better labelled as Undetermined Tyrannosaur, a T rex, or has Albertosaurus actually been found there? Apologies for pictures. The actual fossil is in storage box at my UK home, I'm in Taiwan and wont be going back there until COVID is over. S
  25. gturner333

    ankylosaurus tooth?

    I found this in some Lance formation matrix. Might it be an ankylosaurus tooth? If not, what do you think it may be? Thanks for any help. The hash marks are 1mm.
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