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  1. Jeffrey P

    Western Adventure Part 6

    One week fossil collecting trip out west, my sixth time in the past six years. Flew into Denver. Rented a car and headed down to Castle Rock where I spent the night at a motel. Next day drove up to Florissant Fossil Quarry. It was Wednesday and they're normally closed during the week in September, but I made special arrangements for a few hours visit. Compared to my two previous visits there, didn't do as well. The other times, I was there for the whole day, this time was just for three hours, and they had had a considerable amount of rain recently and so the shale was more crumbly and more difficult to split. Here are some of my finds. Plants:
  2. Jurassicbro238

    Lance shark tooth ID help

    A friend of mine found this tooth in Niobrara county, Wyoming while sifting at a microsite. I was thinking Chiloscyllium but I'm not 100% sure and I don't know much about shark tooth ID. Does anyone know what it is? The pinhead is 1.2 mm long for scale.
  3. Ericlin

    Ceratopsian frill or horn

    Hello, I have this fossil, and I was wondering whether it is a ceratopsian frill or horn, it looks like a frill but seems to be circular. It’s from the Lance formation and measures about 2 inch in length. As always thanks!
  4. Ericlin

    Lance formation fossils

    Hello, I brought some lance formation channel deposit matrix and was wondering if anyone could help id some of the weirder fossils. Thanks. 1. Some sort of scale? Maybe garfish? 2.skull piece? Not sure 3.not sure 4.not sure 5. Turtle shell? 6.not sure 7.skull piece? 8.gastralia? 9.not sure 10.not sure 11. Theropod toe bone? 12. Could it be identified as a theropod claw frag? 12.not sure Appreciate any help, and thanks
  5. FF7_Yuffie

    Lance Formation Tyrannosaur Tooth

    Hello everyone, Any thoughts on this Tyrannosaur tooth? It is just over 1 inch long, from Lance Formation, Weston County, Wyoming. It is one I bought years ago -- labelled as Albertosaurus, but given the formation, clearly not. But is it a Nano or a Rexy? cheers
  6. PaleoZorryn

    Lance Formation Bone Id

    Hello fellow fossil hunters, I have a bit of a problematic guess here. I have a bone from the Lance Formation of Wyoming and need some help IDing it. It seems to resemble something like a crocodile coracoid, but not as spot on as I hoped it would. If you have any suggestions I would be glad to here them. Appreciate the help and if you have identified my mystery bone, please send sources to how you know what bone it is. Never will pass an opportunity to learn. Thank you.
  7. Hello, does anyone know some of the described soft shell turtles from the Lance Formation? Or a paper of some of the turtles. I am interested in a soft shell turtle from the Lance so any help is appreciated. Thanks.
  8. jikohr

    Is this a T-Rex Belly Rib?

    Hi everyone! I have my eye on this piece that is claimed to be a belly rib from a T-Rex from the Lance Formation of Niobara County Wyoming. The seller claims it's robustness positively ids it as rex, but seems to have forgotten to list exact measurements, which I have contacted him about and am awaiting a response which I will post as soon as I get it. Even then, always good to double check these things! Any insight is greatly appreciated as always!
  9. Edited 3/11/23 to better reflect current info. I've recently gotten interested into the turtles of the Hell Creek and Lance formations and decided to compile what I've gathered onto here. It's amazing to see how many different species have been described from these deposits. I've also tried to attach links to papers that talk about these turtles (at about 22 species!). If I've gotten anything wrong or missed anything please let me know! Adocidae: Adocus sp. (part30043.pdf) listed as being present Baenidae: (https://www.researchgate.net/publication/283851398_A_Review_of_the_Fossil_Record_of_Turtles_of_the_Clade_Baenidae) "Baena" hayi Boremys pulchra (https://www.researchgate.net/publication/241730757_Anatomy_and_relationships_of_the_turtle_Boremys_Pulchra_Testudines_Baenidae) (https://www.researchgate.net/publication/362931080_Stratigraphic_range_extension_of_the_turtle_Boremys_pulchra_Testudinata_Baenidae_through_at_least_the_uppermost_Cretaceous) Cedrobeana putorius (A_Revision_of_Plesiobaena_Testudines_Baenidae_and_.pdf) Eubaena cephalica (https://www.researchgate.net/publication/326165618_A_Description_of_the_Skull_of_Eubaena_Cephalica_Hay_1904_and_New_Insights_into_the_Cranial_Circulation_and_Innervation_of_Baenid_Turtles) Eubaena hatcheri Gamerabaena sonsalla (https://www.researchgate.net/publication/238706760_A_New_Baenid_Turtle_from_the_Upper_Cretaceous_Maastrichtian_Hell_Creek_Formation_of_North_Dakota_and_a_Preliminary_Taxonomic_Review_of_Cretaceous_Baenidae) Hayemys latifrons Peckemys brinkman (see Cedrobaena) Palatobaena cohen Saxochelys gilberti (https://www.researchgate.net/publication/336314521_A_new_baenid_turtle_Saxochelys_gilberti_gen_et_sp_nov_from_the_uppermost_Cretaceous_Maastrichtian_Hell_Creek_Formation_sexual_dimorphism_and_spatial_niche_partitioning_within_the_most_speciose_group_o) Stygiochelys estesi (https://digitallibrary.amnh.org/handle/2246/2652?show=full) Thescelus insiliens Chelydridae?: Emarginachelys cretacea (https://www.biodiversitylibrary.org/part/17248) Compsemydidae: Compsemys victa (https://www.researchgate.net/publication/232688551_Cranial_Anatomy_and_Phylogenetic_Placement_of_the_Enigmatic_Turtle_Compsemys_victa_Leidy_1856) Kinosternidae: Hoplochelys clark (https://www.researchgate.net/publication/226429911_A_new_kinosternoid_from_the_Late_Cretaceous_Hell_Creek_Formation_of_North_Dakota_and_Montana_and_the_origin_of_the_Dermatemys_mawii_lineage) Sinemydidae?: Judithemys backmani (https://www.researchgate.net/publication/232696535_Macrobaenidae_Testudines_Eucryptodira_from_the_Late_Paleocene_Clarkforkian_of_Montana_and_the_Taxonomic_Treatment_of_Clemmys_backmani) Nanhsiungchelydidae: Basilemys sinuosa (B023a33.pdf) listed as being present Trionychidae: Axestemys infernalis (https://www.researchgate.net/publication/337382811_A_new_species_of_trionychid_turtle_Axestemys_infernalis_sp_nov_from_the_Late_Cretaceous_Maastrichtian_Hell_Creek_and_Lance_formations_of_the_Northern_Great_Plains_USA ) (https://www.researchgate.net/publication/260636886_Giant_fossil_soft-shelled_turtles_of_North_America) Hutchemys sterea (https://escholarship.org/uc/item/6090612k) Hutchemys walkerorum (https://www.sciencedirect.com/science/article/abs/pii/S0195667122000362) Helopanoplia distincta (https://peerj.com/articles/4169.pdf) Gilmoremys lancensis ( https://www.researchgate.net/publication/259887738_New_Material_of_Gilmoremys_lancensis_nov_comb_Testudines_Trionychidae_from_the_Hell_Creek_Formation_and_the_Diagnosis_of_Plastomenid_Turtles)
  10. Hello! As I've gone through what I've collected this past summer, I'm finding really interesting things that I took home with me. These come from Niobrara County in Wyoming. I've taken pics of various angles of the fossils. Scale bar has inches (top) and cm (bottom). I'm not completely sure what some of these pieces are so any ideas or suggestions would be helpful. Thanks in advance! Set 1: Vertebral Process Is it possible to ID a process this broken up? I'm thinking it's Edmonto but really holding out for Triceratops Set 2: Triangular bone A friend suggested it might be a Triceratops epoccipital so I wanted to see what you all think Set 3: Skull fragments? There's a lot of blood vessels that would've run through these bones. I'm thinking they might be Triceratops frill (haha can you tell I want some Trike material?) Any thoughts or should I leave the ID at unknown? Either way, they look really interesting. Set 4: Scute? I don't see an identifiable pattern on it but that line running through it makes me think turtle scute. Set 5: Unknown I'm not sure what these are. They both have a really interesting textures running on the surface and they are very thin. Set 6: Jaw piece? Finally, this neat piece that I found on an ant hill. Looks like a jaw piece to me but not holding my breath.
  11. Jurassicbro238

    Lance Formation Fossil ID

    I was able to dig in the Lance Formation last summer and finally got the chance to look at this find more closely. I don't think this is a dinosaur fossil and I'm not familiar with the skeletal anatomy of the other vertebrates at the site. Anyone know what it is? I tried taking all the relevant angles. This one came from Niobrara County in Wyoming if that helps.
  12. Edited (04/14/23) With all of the new discoveries over the past few years there is very little out there that is current or accurate. Here is my view of the Dinosaurian/Crocodilian fauna from the Hell Creek and Lance Formation excluding Avialae. Let me add that the lack of a large dataset or complete specimens leaves many unanswered questions for many of these genera. New discoveries will be needed to firm up a any listing of the fanual listing Tyrannosauridae: - Tyrannosaurus rex (Osborn 1905) - Nanotyrannus lancensis (Bakker et al. 1988) - Aublysodon mirandus (Not Valid) Alverezauridae: - Trierarhunchus prairiensis (Fowler et al. 2020) Ornithomimidae: - Struthiomimus sedens? (Marsh 1982) - Ornithomimus velox (March 1890) Caenagnathids: - Anzu wyliei (Lamanna et al. 2014) - Caenagathid indet. including Leptorhynchos (Discussion with P. Larsen multiple additional species probably exist and fragmentary material is known) Dromaeosauridae: - Acheroraptor temertyorum (Evans et al. 2013) - Dakotaraptor steini (DePalma et al. 2015) - Dromaeosaurid indet. (Discussion with P. Larsen and the fact that numerous isolated teeth & foot claws exist which do not fit the other two taxons) - Microraptoria indet. ? (Based on isolated bones in my collection ID as possible by prominent paleontologist, also known from North American Campanian deposits) Troodontidae: - Pectinodon bakkeri (Carpenter 1982) - cf Troodon formosus - cf Zapsalis abradens (not valid) Other Theropods: - cf Richardoestesia gilmorei - cf Richardoestesia isosceles - cf Paronychodon lacustri Ankylosauria: - Ankylosaurus magniventris (Brown 1908) - Denversaurus schlessman (Bakker 1988) - cf Gilyptodontopelta (Nodosaur)(Partial skeleton exists and in the process of being studied by a major museum) (have an isolated osteoderm in my collection, its very distinctive) Pachycephalosauria: - Pachycephalosaurus wyomingensis (Gilmore 1931) - Sphaerotholus buchholtzae (Williamson et al. 2002) - Platytholus clemensi (Horner et al. 2023) Ceratopsidae: - Leptoceratops gracilis (Brown 1914) - Leptoceratops sp. (BHI fragmantry material) - Tatankaceratops sacrisonorum (Ott & Larsen 2010) - Torosaurus latus (Marsh 1891) - Triceratops horridus (Marsh 1889) - Triceratops prorsus (Marsh 1890) Others more problematic: - Triceratops sp 2 (Fowler 2017) (MOR 3027 Yoshi specimen) - ?Chasmosaurine MOR 1122 7-22-00-1 - ?Ceratopsian indet. (skulls floating around that are claimed to be a new species including: Nedoceratops hatcher, Lance Fm and Duranteceratops, Hell Creek Fm) Hadrosauridae: - Edmontosaurus annectens (Lambe 1917) - ?Lambeosaurine (Based on a large humerus) Thescelosauridae: - Thescelosaurus neglectus (Glmore 1913) - ?Thescelosaurus gabanii (Morris 1976) (Based on fragmentary material) (A poster was presented at the SVP 2022 meeting of two T. neglectus skulls identified as Male and Female...T gabanii?) Crocodylia: - Borealosuchus sternbergii (Brochu 1997) - Brachychampsa montana (Gimore 1911) - Thoracosaurus neocesariensis (de Kay 1842) - ? Prodiplocynodon langi (Mook 1941)
  13. DSMJake

    Lance Formation Trunk Cast

    Need some help from our plant experts. This is a 3D trunk cast that I found in the Lance Formation. There’s plenty online regarding leaves, but I couldn’t find anything regarding trunk identification. Thanks!
  14. 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).
  15. 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).
  16. These are multituberculate teeth found in the lance formation, I have yet to identify all of them and would like some insight. I have to post these in groups because there are so many but I can share the animals I think show the closest resemblance.
  17. Lydia.K.Tyree

    Lance formation teeth

    These are photos of an unidentified tooth from the lance formation in Wyoming, it was put in a group of mammal teeth all approximately in the range of 2-4 mm in size. Among the teeth two of them have been identified as shark, one is a Lissodus and the other is unknown as of now. If there are any ideas as to what this tooth could be please do share.
  18. Nanotyrannus35

    Lance Formation Toe Bone?

    While looking through my Lance Formation matrix, I'd found this strange bone that looks like it might be a toe bone. Here are the pictures. The scale is in millimeters and the specimen is from Weston county, Wyoming. Thanks for any help.
  19. The title says it all. It’s a nice tooth, but I’m going back and forth on it because the telltale wear patterns for either group are not present as far as I can see. I apologize for the poor quality of my camera phone picture.
  20. FF7_Yuffie

    Small Lance Formation tooth

    Hi, I am interested in this tooth, and wondering if someone can narrow it down further. It is theropod tooth, from Weston County, Wyoming, Lance Formation. Waiting to hear back from seller on exact measurement, but included a photo of it near a tape measure. Thanks
  21. Opabinia Blues

    Lance Fm. Mystery (ungual?) Bone

    I’ve had this piece of a mystery bone, I think it may be an ungual, from the Lance Formation for a while now but haven’t been able to identify it. Finally decided to post it here and see if I can get an opinion. Any help is appreciated!
  22. 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.
  23. ThePhysicist

    Meniscoessus molar

    From the album: Miscellaneous

    Uncommon Mesozoic mammal (multituberculate) tooth from the Lance Fm. ID'd here.
  24. Edmontosaurus annectens may have been the largest dinosaur in the Hell Creek/Lance Formations not T rex. Here is an article that gets into the specifics. https://thesauropodomorphlair.wordpress.com/2021/02/10/size-of-the-duck-titans/
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