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Hello all! Here I am with yet another question the same as all the other ones I ask. “What is this fossil tooth?” I found it online. I believe it to be a theropod, but can anyone officially identify it? It was found in Hell Creek, if that helps. If I can find out in the next 3 days that would be great, as that is when it is going.
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Hi All, I'm new to this forum and thought I'd send over images of my theropod teeth plus one extremely impressive sauropod from Madagascar. Hope you like them! Paul
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Machine learning identifies possible Deltadromeus tooth
BirdsAreDinosaurs posted a topic in Fossil News
By combining several analytical methods, including machine learning, to assess the diversity of a collection of theropod teeth from the Kem Kem beds, researchers found a tooth that could possibly be assigned to Deltadromeus agilis. https://www.tandfonline.com/doi/full/10.1080/02724634.2024.2311791 https://www.uu.nl/en/news/higher-carnivorous-dinosaur-biodiversity-of-famous-kem-kem-beds-morocco -
Found this tooth in my Aguja Formation micro matrix. It's about 6mm in length. I know it's in really rough shape, and I actually broke it in half attempting to get pictures of the distal/mesial sides. Can anyone give me an idea of what it may be? Could it be a theropod tooth? I don't see any evidence of serrations on either side. Sorry if the pictures are not the best. It was extremely difficult to take pictures, especially after it broke in half. Base of tooth Distal Mesial
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Hi! This is a 19MM rooted theropod tooth from the KemKem group. Sold as an Abelisaurus. But would it be possible to be a Baby rooted Carcharodontosaurus tooth? Not sure.
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Giant Dromaeosaurs and other Eumaniraptora from the Cretaceous period
Joseph Fossil posted a topic in General Fossil Discussion
The Eumaniraptora is a clade of non-avian theropod dinosaurs that first emerged during the late Jurassic period and diversified extensively during the subsequent Cretaceous period (143-66 Million years ago). This group is most famously known as the Raptor dinosaurs (the sister clade of the theropod dinosaurs that gave direct rise to the birds), consisting of mostly small to mid sized theropod dinosaurs. There are a few species though that exceed the typical small-medium size range for the raptor dinosaurs. Only a few giant raptor dinosaurs are currently known. But recent discoveries over the past few decades have demonstrated large raptor dinosaurs were less of an exception in Cretaceous ecosystems than previously thought. Here is a list of all the currently known giant Eumaniraptora from the fossil record which hopefully can expand our understanding the vital roles these animals played in the ecosystems they once inhabited. Let me know if I forgot any examples. South America Austroraptor cabazai (Dromaeosauridae - Argentina, South America) (Late Cretaceous (78-66 Million Years ago)) (grew up to 6 meters (20 feet) in length) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2679073/ Antarctica Imperobator antarcticus (Eumaniraptora - part of what is now James Ross Island, Antarctica) (Late Cretaceous (71 Million Years ago)) (grew up to 4 meters (13 feet) in length, note: did not have the iconic pair of sickle shaped claw on its feet like most other Eumaniraptora) https://www.sciencedirect.com/science/article/abs/pii/S0195667118300120?via%3Dihub Asia Achillobator giganticus (Dromaeosauridae - part of what is now Mongolia, Asia) (Late Cretaceous (96-89 Million Years ago)) (grew up to 5 meters (16 feet) in length) Perle, A.; Norell, M. A.; Clark, J. M. (1999). "A new maniraptoran Theropod−Achillobator giganticus (Dromaeosauridae)−from the Upper Cretaceous of Burkhant, Mongolia". Contributions from the Geology and Mineralogy Chair, National Museum of Mongolia (101): 1−105. Unnamed Bissekty Formation Giant Dromaeosauridae (Dromaeosauridae (could possible be a species of Itemirus) - part of what is now Uzbekistan, Asia) (Late Cretaceous (92-90 Million Years ago)) (based on Specimens CCMGE 600/12457, ZIN PH 11/16, grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/263891965_Dromaeosauridae_Dinosauria_Theropoda_from_the_Bissekty_Formation_Upper_Cretaceous_Turonian_of_Uzbekistan_and_the_phylogenetic_position_of_Itemirus_medullaris_Kurzanov_1976 https://www.cambridge.org/core/journals/geological-magazine/article/abs/giant-dromaeosaurid-theropod-from-the-upper-cretaceous-turonian-bissekty-formation-of-uzbekistan-and-the-status-of-ulughbegsaurus-uzbekistanensis/4543ABAB1EC19C84405EDF66A5F53124 Europe Unnamed Wessex Formation Giant Dromaeosauridae (Dromaeosauridae (specimens for this species could belong to Vectiraptor) - Isle of Wight, Great Britain, Europe) (Early Cretaceous (125 Million Years ago)) (based on Specimens IWCMS.2002.1, IWCMS.2002.3, IWCMS.2002.4., and BMNH R 16510, grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/222830089_The_first_record_of_velociraptorine_dinosaurs_Saurischia_Theropoda_from_the_Wealden_Early_Cretaceous_Barremian_of_southern_England https://www.sciencedirect.com/science/article/abs/pii/S0195667121003712 Unnamed Giant Dromaeosauridae (Dromaeosauridae - Gorodishchenskii District Russia, Europe) (Late Cretaceous (72.1-66.0 Million Years ago)) (based on Specimen VGI. no. 231/2, grew up to 5.8 meters (19 feet) in length) https://www.researchgate.net/publication/235806763_Carnivorous_dinosaurs_Saurischia_Theropoda_from_the_Maastrichtian_of_the_Volga-Don_Interfluve_Russia North America Utahraptor ostrommaysi (Dromaeosauridae - Western North America) (Early Cretaceous (135-130 Million Years ago)) (grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/285714464_A_large_dromaeosaur_Theropoda_from_the_Lower_Cretaceous_of_eastern_Utah Dakotaraptor steini (Dromaeosauridae - Western North America) (Late Cretaceous (66 Million years ago)) (grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/283655219_The_first_giant_raptor_Theropoda_Dromaeosauridae_from_the_Hell_Creek_Formation Unnamed Marshalltown Formation Giant Dromaeosauridae (Dromaeosauridae - Eastern North America) (Late Cretaceous (72.1 Million Years ago)) (based on Specimen NJSM 14158, grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/327117985_The_distinctive_theropod_assemblage_of_the_Ellisdale_site_of_New_Jersey_and_its_implications_for_North_American_dinosaur_ecology_and_evolution_during_the_Cretaceous https://terpconnect.umd.edu/~gdouglas/raptor/index.html Unnamed Tar Heel Formation Giant Dromaeosauridae ((Dromaeosauridae - Eastern North America) (Late Cretaceous (78.5-77.1 Million Years ago)) (Based on Specimen YPM.VPPU.021397, grew up to 3.4 meters (11 feet 2 inches) in length) https://peerj.com/preprints/26829/ Alaska Troodontid (Troodontidae (could be a species of Troodon or a new genus in Troodontidae) - Prince Creek Formation Alaska, Western North America) (Late Cretaceous (70.6-69.1 Million Years ago) (grew up to almost 4 meters (13 feet) in length) https://www.researchgate.net/publication/236632883_On_the_Occurrence_of_Exceptionally_Large_Teeth_of_Troodon_Dinosauria_Saurischia_from_the_Late_Cretaceous_of_Northern_Alaska Latenivenatrix mcmasterae (Troodontidae - Dinosaur Park Formation, Alberta Canada, Western North America) (Late Cretaceous (75.5 Million years ago)) (grew up to 3.5 meters (11.5 feet) in length) https://tspace.library.utoronto.ca/bitstream/1807/78296/1/cjes-2017-0031.pdf Unnamed Mount Laurel Formation Giant Dromaeosauridae (Dromaeosauridae - Eastern North America) (Late Cretaceous (72.1 Million Years ago)) (based on Specimen NJSM GP 22949, grew up to 3.4 meters (11 feet 2 inches) in length) https://royalsocietypublishing.org/doi/10.1098/rsos.191206 What do you guys think?- 11 replies
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From the album: Hell Creek Formation Microsite
Identifying features of the troodontid, Pectinodon. The illustration is the holotype, adapted from Carpenter 1982, the color image is a specimen in my collection. These are thought to be anterior dentary teeth; medial/posterior positions lack the lingual pitting, and may have fine serrations at the base of the mesial carina. Carpenter, K. (1982). "Baby dinosaurs from the Late Cretaceous Lance and Hell Creek formations and a description of a new species of theropod". Contributions to Geology, University of Wyoming. 20 (2): 123–134.-
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Got a new box of mixed KemKem material the other day; plenty of Spino, Carch, small theropod, croc, fish, and other usual suspects, but I can't put a name to this one. I'm fairly sure it's theropod, but since there is so little info available, it's hard to say which one. Anyone recognize this little fella? It's 32mm long by 21.5mm at the widest point; the grid squares are 1"/25.4mm. I can take additional pix if needed. Thanks!
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Hi All, I found this tooth sifting in one of the Cretaceous brooks in Monmouth Co., NJ. during a trip around November last year I wasn't sure what it was at first (initially thought talon possibly from something more recent), however after showing photos to a few local folk more familiar/knowledgeable with the fossils in this area (Thanks @frankh8147!), the consensus was, it's a very compressed Mosasaur tooth. Makes sense as Mosasaur teeth can be found here on occasion, and this tooth has several common features. However, I've had a couple individuals suggest theropod tooth when I initially shared it in a couple groups back in November. This was based on the compression of the root. I'm still leaning towards Mosasaur, but recently a different person brought up the theropod theory, so I thought why not throw it up here for opinion. Multiple photos, some redundant (have done a couple "photo shoots" with this one lol). If photos of any specific area would be beneficial, please let me know. Thanks in advance for your feedback/opinions! Truly appreciate the help.
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What are the rarest theropods in the Elrhaz formation?
Brevicolis posted a topic in Questions & Answers
Hello guys, I have a question: what are the rarest theropods in the Elrhaz formation? And what are the rarest herbivore fossils from the Elrhaz formation? I want to expand my collection whith some teeth from there. If somebody knows, let me know. -
Hello, i have a question : are herbivore fossils rarer than theropod fossils? Because i saw many theropod fossils, but nearly no herbivore fossils on the fossil markets, which makes me wonder .
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Last year when things weren’t so complicated with COVID, we managed to have hunt for dinosaur footprints on the Yorkshire coast. Here’s the beach looking across to Scarborough in the distance. Here are some examples of the prints we came across: Nothing fantastic but all theropods. Heres one in a block that was carry-able: I finally got around to cutting the block to size today although it was freezing outside. So here you go, Theropod Footprint, circa 5 inches long. Middle Jurassic Bathonian (168-166 million years) Scalby Formation Long Nab Member Yorkshire Coast Nr Scarborough Thanks for looking
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Collages of dinosaurs made with pictures of fossil teeth
BirdsAreDinosaurs posted a topic in Paleo Re-creations
This is a fun project that I have been working on for the past few months. Fossilized dinosaur teeth from the Kem Kem beds in Morocco showcase a wide variety of colours and patterns, caused by the varying conditions under which they were fossilized. To me, these colours and patterns are rather beautiful. Therefore I decided to ask a colleague of mine, who is a professional photographer, to take pictures of my small collection of teeth, so I could use these pictures to create collages of the original owners of the teeth. Using this approach, I made images of theropods from five different families. The animals on the images inhabited what is now known as Morocco about 100 million years ago. Here they are. The white bar next to the teeth represents 1 cm. This one I based on the species Spinosaurus aegyptiacus. This one is based on Rugops primus. I was inspired by the patterns of the Gila monster. Based on Deltadromeus agilis, which might be a noasaurid. As no skull of this dinosaur has ever been found, I am not sure that these are actually teeth of Deltadromeus. The other side of the smaller tooth shows an interesting white pattern, caused by plant roots growing on the fossil. Based on Carcharodontosaurus saharicus. I am not certain that these teeth are dromaeosaurid, but they do have characteristics that indicate that they might be. I love the pattern on the smaller tooth, which made it pretty easy for me to create a feathered look. I went ahead and got cards printed with the collages on the front. On the back I have included the family names and the specific teeth I used for each collage, at full size! It was a fun and refreshing experience to try a completely different approach to making illustrations.- 6 replies
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Hi all, I recently bought this partial theropod tooth form the Lourinha Formation (Portugal). Height ~1.1 cm. The distal serration density is 8-8.5/5 mm, the mesial serration density is 7.5-9/5 mm. Crown ornamentations are present and I think also interdenticular sulci. I looked at an old post of Troodon (see below). Are there any other known theropods from this location, besides Torvosaurus, that have a crown serration density < 9/5mm? Any thoughts?
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Howdy all, Anyone willing to trade me an Appalachiosaurus, or any black creek theropod tooth? Been dying to get one.
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- appalachiosaurus
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Hello, Anyone have any thoughts on this I am interested in? A small theropod tooth from Brook Bay, Isle of Wight. 0.43cm so it is a tiny tooth. Small, just visible serrations. Oval base. Wondering if someone can narrow the type down. cheers
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Theropod toe bone found in the Hell Creek formation Montana. Any ideas what kind of raptor this is from?
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Found in the Horse Shoe Canyon formation (Alberta) with several bones including theropod teeth. It has the right shape and size to be a claw. Any ideas? About 1 inch long
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Hey all, I got this a while back, but it was too covered in matrix to do any solid ID'ing--until today! Appreciate any ID info/opinions you have. From the Cloverly formation, Montana CH: 12.6mm CBL: 6.8mm CBW: 3.3mm Mesial serration density: about 6/mm Distal serration density: about 3.6/mm Transverse undulations I'm not sure about interdenticular sulci, but I think that box is checked too Prayer
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I recently found on the site cults3d a very beautiful and almost complete skeleton of Microraptor gui to print with a 3D resin printer. Here is the link: https://cults3d.com/fr/mod%C3%A8le-3d/art/microraptor-gui-skeleton The only problem was the skull was missing. The creator of this specimen, Florent Germain, had not had time to finalize his skull. He'll put it later, when finished, he said. I was able to print this model and I decided to make the skull myself Lucky me, I was able to use a dental scanner (not too suitable for this kind of models) and to generate a 3d printable file . The STL file of the skull is available for free. I am not a pro of 3D modeling software so be indulgent with the result. This file can be modified or improved for the person who can. Here the link : https://cults3d.com/fr/modèle-3d/divers/microraptor-gui-dinosaur-skull-open-source I haven't tried to print it on a printer, but it should work. Enjoy ! Some photos of the skull and skeleton, I'll update this topic when everything will be finished.
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Found this super, super small claw today. Just over half an inch in length. Looks kind of ornithomimid but I’m not sure. Anyone have a better guess? dinosaur park fm
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From the album: Triassic
From the "dawn" of the Dinosaurs, this small tooth represents an early theropod. Unlike the other serrated archosauriform teeth present in the formation, this tooth is ziphodont - thin and labio-lingually compressed - the archetypical tooth form that most theropods adhered to since their beginnings.-
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From the album: Hell Creek / Lance Formations
This rare theropod tooth was found via screen washing matrix from a channel deposit. It's large for the species and from the front of the jaw. All of the denticles are intact - a spectacular specimen. Pectinodon (meaning "comb-tooth") is a tooth taxon, since no remains attributable to the genus beyond teeth have been found. Pectinodon seems to be a rare member of the Hell Creek fauna, with their teeth being fairly uncommon (though being so small, I'd guess that few people actively search for them). It was a small Troodontid theropod, with teeth that couldn't handle stresses as well as their Dromaeosaurid and Tyrannosaurid cousins (Torices et al. (2018)). This coupled with their small size suggest that Pectinodon was a small/soft prey specialist, preferring the rodent-sized mammals of the time, lizards, insects, etc. Some researchers have proposed omnivory as a possibility for Troodontids (cf. Holtz et al. (1998)). Troodontids famously are regarded as among the most intelligent dinosaurs for their large brain size / body size ratio. This notion serves as fodder for speculation that had the dinosaurs not gone extinct, Troodontids (Pectinodon being (one of?) the last) would have continued to grow in intelligence and develop sentience and civilizations. Troodontid teeth like Pectinodon can be easily identified by their small size, exaggerated, triangular, apically oriented posterior serrations.- 1 comment
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