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Showing results for tags 'theropod'.
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Any idea what this little tooth could be from? It was found in the Hell Creek formation outside of Faith, South Dakota. It has no serrations and the seller says it may be a juvenile richardoestesia.
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Hello everyone. A few weeks ago I received this piece of matrix with remains claimed to be Allosaurus, from the Morrison Formation. I'm not sure if they're even dinosaur, but I bought them anyway to experiment with cleaning it. What is highlighted in green, in the first photo, is where I was cleaning up with a dremel engraver. From a previous post that I saw on the forum, where someone was asking about this same fossil (I apologize if I bought it ahead of time), I read that they suggested just exposing the bones a little more, and preparing the matrix. It's what I'm doing. But since I don't have paraloid or butvar, in some parts to reinforce the fragile bones I applied super glue, one that is quite liquid and absorbs very well through the cracks, I apply it by drops using a syringe. Maybe I did wrong, but it is the only thing that could have been done in the absence of something better, and I find that it has stabilized the bones very well so that they do not crumble. In the parts highlighted in blue in the first photo and those that follow, there are spaces in the matrix where there was bone, which surely eroded and only the mold remained. The matrix is quite hard, so I don't think it needs any additional need. My doubts are: a) Are Allosaurus rib fragments effectively treated, as suggested in the publication? b) If they are not, is it possible to tell if it is a theropod, sauropod or other type of animal? Thank you very much in advance.
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Is anyone able to actually ID a claw like this? It is 9CM straight. Footclaw or handclaw even? Niger claw as you can see. And I am aware there is not that much information to ID a claw. But this one is pretty much complete.
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Hi everyone, this is my first post on here. This specimen was labelled as a 'dinosaur jaw bone' and it was found in the Hell Creek Formation near Glendive, Montana. It is about 27 mm long. It does seem to me it belongs to a reptile of some sort but I haven't been able to find anything on the internet to identify it with any more specificity so I'd really appreciate your expertise in identifying it. Thanks everyone!
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Hi all. These are four theropod teeth from the Kem Kem beds that I am not sure about how to assign them. I was hoping you could have a look and let me know what you think. 1. A 3 cm long tooth, I think this one might be Carcharodontosaurid. 2. This one is 1.9 cm long. Distal serrations are slightly less dense than mesial ones. 3. A small one, 1.5 cm. Hard to measure, but mesial denticles appear to have a slightly higher density. 4. A 2 cm ugly one Thanks! Let me know if you need more info or pictures.
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From the album: Hell Creek / Lance Formations
Even in the final years of the non-avian dinosaurs, the paravians remained diverse, with many species represented in the famed Hell Creek formation.- 1 comment
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Did Tyrannosaurus ever colonize the Eastern U.S. during the Late Cretaceous
Joseph Fossil posted a topic in General Fossil Discussion
Tyrannosauridae Dinosaur diversity was unique in the Western and Eastern areas of the North American Continent during the Late Cretaceous era around 95-66 Million Years ago) as a result of a seaway the cut the continent in two (creating the continents of Laramidia (now Western North America) and Appalachia (now Eastern North America)). By the Maastrichtian stage of the Cretaceous 68 Million Years ago, the seaway decreased in size and a land bride formed between Laramidia and Appalachia. https://deeptimemaps.com/western-interior-seaway/ This is around the same time Tyrannosaurus rex emerged in Laramida and other Tyrannosauridae including the smaller Dryptosaurus lived in Appalachia. Map of the currently known Tyrannosaurus rex fossil discovery sites Maps of the currently known Maastricthian Tyrannosauridae fossil discovery sites in Eastern North America (not shown on the maps here are Late Cretaceous Tyrannosauridae fossil sites in South Carolina and North Carolina) https://paleobiodb.org/navigator/ What I'm wondering is even with this land bridge formed, what prevented Tyrannosaurus from colonizing the Eastern portion of North America during the Maastricthian Cretaceous? If it didn't prevent this, has there been any fossils found in the Eastern portion of North America that belong to the Tyrannosauridae genus Tyrannosaurus?
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Isolated theropod Teeth from the Kem Kem Basin continue to be a mystery. Plan on documenting all the different morphologies I have in my collection to see the variation that exists. Currently we cannot identify any one to a specific species or genus possibly family. I can provide discussion and aid in identification at some point. Just a note, different morphologies do not necessarily mean different species. There are lots of tooth variations in the dentition of a theropod, why its so difficult to nail down an ID even in the best of circumstances. Morph Type 1 Anterior Tooth (possibly Carcharodontosaurid) Distal margin is almost straight Mesial margin strongly recurved Mesial carina extends 3/4 crown height Denticles are oriented towards the tip Serration Density: Distal - 2/mm (More dense toward the base) Mesial - 1.7/mm (More dense toward the base) Morph Type 2 (possible Carcharodontosaurid) Anterior Tooth Distal margin is slightly concave Mesial margin strongly recurved Mesial Carina extends to the cervex Denticles are oriented toward the tip Interdental sulci present Serration Density: Distal: 2/mm (More dense toward the base) Mesial: 1.9/mm (More dense toward the base) Morph Type 3 (possibly Carcharodontosaurid) Dentary? Mesial Mesial carina extends 3/4 crown height Denticles parallel to the base and rounded at tip Serration Density: Distal: 2.2/mm (More dense toward the base) Mesial: 2.4/mm (More dense toward the base) Additional Example Morph Type 4 (Possible Dromaeosaurid like) Lateral Tooth Tooth is recurved Mesial Carina extends to 3/4 crown height with a lingual twist Denticles parallel to the base Serration Density: Distal: 3.6/mm Mesial: 4.6/mm Additional Example Serration Density: Distal 3/mm, Mesial 5/mm Morph Type 4A (Dromaeosaurid like) Tooth is slightly recurved Mesial Carina extends to base with a lingual twist Denticles parallel to the base Serration Density: Distal: 3.6/mm Mesial: No Serrations Additonal Example Serration Density: Distal 3.3/mm, Mesial: No Serrations
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Spinosaurid Rooted Tooth (Composite root?)
Meatasaurus93 posted a topic in Is It Real? How to Recognize Fossil Fabrications
I recently picked up this "rooted" spinosaurid tooth, and I wanted to get some feedback on it. I have provided both the seller's original pictures and pictures I took of the tooth. My best guess is that there are authentic root elements present, but it's a composite piece. There is a clear seam that runs along the center of the root, indicating that the bottom half of the root was attached to the rest of the tooth. That doesn't always mean that it's a composite, but it's really hard to tell whether the two halves are associated. My inclination is they are not, but I am also not an expert on rooted theropod teeth. The base of the root looks real, but from mid-root up to the base of the crown, it's really hard to tell what is filler and what is root. Normally, I wouldn't pick up a tooth that was this questionable, but the seller assured me I could return it if I wasn't happy with it. I look forward to reading your responses to this topic. Seller's pictures: My pictures: I circled the seam/break that I mentioned above:
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Hi all, Curious to know what family you think this tooth likely came from. Could it be Allosaurid? From Isalo IIIb in the Mahajanga basin of Madagascar CH: About 27.5mm (estimating for tip) CBL (carina-to-carina): 14mm CBW (mesial side to distal side): 8.5mm Mesial Serration Density: 1.9mmm Distal Serration Density: 2.1/mm Thank you!!
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Found a partial theropod claw and some other one, not sure if it’s even a claw but I figured I would check. dinosaur park fm
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Hey all, Curious to see if you have similar thoughts about this tooth. In terms of that possibility that it's not, in fact, from the Jurassic, I'm not sure I'm seeing the kind of denticle shape/hooking and marginal undulations of Majungasaurus. From Isalo IIIb in the Mahajanga basin of Madagascar CH: About 27.6mm CBL (carina-to-carina): 13.9mm CBW (mesial side to distal side): 7.5mm Mesial Serration Density: 2.2mmm Distal Serration Density: 1.9/mm Thank you!
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Hi everyone! I have my eye on what looks like a nice Spinosaur claw from the kem kem, or at least that what the seller claims it is. It does seem to have that round divot under the base of the proximal end that I've seen described as telltale, but you can never be to careful with kem kem claws which might just be the most outright faked fossil on the market so I figured I'd ask for an independent opinion on the potential of funny business (besides what looks to be one or two repaired breaks near the tip). Measurements given are 8.5 x 3 cm. Any insight is appreciated as always!
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Hi everyone! I've had this little Kem Kem tooth for a while now and was hoping for some help IDing it. My gut is telling me premax, maybe from a little Carch which I'm guessing from the thickness though it will probably wind up in the indet. Theropod pile. No base to provide CBL and CBW so I took measurements at the best cross section that was left. There is a mesial carina though it is very subtle and only extends halfway down the specimen's length. Any insight is appreciated as always!
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Fragment takes up most of the sediment which is 1.5cm please not the serrations in the photos. All photos are the same with different lighting. @Troodon @jpc Is this actually a tooth fragment or are the serrations fooling me?
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Big news today impacting the ongoing controversy if large theropods were lipped. Abstract: Large theropod dinosaurs are often reconstructed with their marginal dentition exposed because of the enormous size of their teeth and their phylogenetic association to crocodylians. We tested this hypothesis using a multiproxy approach. https://www.science.org/doi/10.1126/science.abo7877 Mark Witton blog http://markwitton-com.blogspot.com/2023/03/new-paper-fresh-evidence-and-novel.html
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The other day, I was indebted to you for the spinosaurus vertebral fossil. I have a question. Does the dinosaur's air sac match the marked part in the picture? The fossil in the photo is the sacrum of spinosauridae. Thank you . (⌒‐⌒)
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Is there a way to distinguish the vertebral of theropods and ornithopods? They the same to the untrained eye.
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Hello, I saw this tooth labeled as an allosaurus from the Morrison formation. Not sure if it’s allosaurus but does look to be. Tooth is from Moffat Counth Colorado. Also is that a sauropod tooth on the matrix on the 2nd pic? Allo tooth is 4.1 cm. Thanks.
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Hi all. This is my take on Deltadromeus agilis, the "agile delta runner". Here it is chasing a nice fat beetle.
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Just want to get some opinions before I purchase a tooth. Do you guys think this is definitely a Dakotaraptor tooth? Or does it look more Nano? Size is .71” and it’s from Hell Creek Formation, Garfield County, Montana. 24506BD7-17AC-42BF-B3C6-7C613A84332B.webp 31C05BFB-8621-4C95-9A7A-4A92A0C553D7.webp E6280DD3-5623-4D78-966F-F7A20751CEFB.webp 7CFB9AAF-269D-48B6-A26E-5265AE476524.webp E04ED762-40B5-42D1-BADA-52A77A44425B.webp
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Is this a theropod claw? Also, is this from Niger, rare? Please tell me. Thanks in advance.
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Hi everyone, I recently acquired a batch of small theropod teeth and was hoping to get a second opinion on some ids since a few seem kinda special. The first one I'm really leaning towards Dakotaraptor. 2-5 I'm not sure. They're all very similar looking but have very different base shapes including oval, almond, pinched rectangle, and pinched almond. The serration densities are also very interesting. The mesial serrations on all are much smaller than the distal serrations. The last one I think is a really tiny T-Rex. It's a dead ringer for a large Rex just very small. All six are from The Hell Creek of Carter County, Montana. Any insight is greatly appreciated as always! Tooth 1: Tooth 2: Tooth 3: Tooth 4: Tooth 5: Tooth 6:
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So when I purchased this tooth it was listed as Timurlengia, however I know there have been recent discoveries of both a large Dromaeosaurid and carcharodontosaurid from this formation. Is there any way to figure out if this is Tyrannosauroid for sure? Uzbekistan - Bissekty Formation @Troodon
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