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Showing results for tags 'theropod'.
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Gigantic Australian carnivorous dinosaurs discovered and studied using footprints
Owl_Roker posted a topic in Fossil News
Hello Fossil Friends, You might have already known or been aware, but I came across this in the news today and thought I’d share it with you. I note that these fossils are not a recent discovery—most just had not been scientifically described, hence the recent publication. ******************** Gigantic Australian carnivorous dinosaurs discovered and studied using footprints North America had the T. rex, South America had the Giganotosaurus and Africa the Spinosaurus—now evidence shows Australia had gigantic predatory dinosaurs. The discovery came in University of Queensland research, led by paleontologist Dr. Anthony Romilio, which analyzed southern Queensland dinosaur footprint fossils dated to the latter part of the Jurassic Period, between 165 and 151 million-years-ago. "I've always wondered, where were Australia's big carnivorous dinosaurs?" Dr. Romilio said. "But I think we've found them, right here in Queensland. The specimens of these gigantic dinosaurs were not fossilized bones, which are the sorts of things that are typically housed at museums. Rather, we looked at footprints, which—in Australia—are much more abundant." He explains, "These tracks were made by dinosaurs walking through the swamp-forests that once occupied much of the landscape of what is now southern Queensland." Most of the tracks used in the study belong to theropods, the same group of dinosaurs that includes Australovenator, Velociraptor, and their modern-day descendants, birds. Dr. Romilio said these were clearly not bird tracks. "Most of these footprints are around 50 to 60 centimeters in length, with some of the really huge tracks measuring nearly 80 centimeters," he said. "We estimate these tracks were made by large-bodied carnivorous dinosaurs, some of which were up to three meters high at the hips and probably around 10 meters long. To put that into perspective, T. rex got to about 3.25 meters at the hips and attained lengths of 12 to 13 meters long, but it didn't appear until 90 million years after our Queensland giants." He says, "The Queensland tracks were probably made by giant carnosaurs—the group that includes the Allosaurus. At the time, these were probably some of the largest predatory dinosaurs on the planet." Despite the study providing important new insights into Australia's natural heritage, the fossils are not a recent discovery. "The tracks have been known for more than half a century," Dr. Romilio said. "They were discovered in the ceilings of underground coal mines from Rosewood near Ipswich, and Oakey just north of Toowoomba, back in the 1950s and 1960s." Most, he said, hadn't been scientifically described, and were left for decades in museum drawers waiting to be re-discovered. "Finding these fossils has been our way of tracking down the creatures from Australia's Jurassic Park." Source: Gigantic Australian carnivorous dinosaurs discovered and studied using footprints ******************** Below are a few links to related news articles: Tracking Gigantic Carnivorous Dinosaurs From Australia’s Jurassic Park Footprints reveal giant carnivorous dinosaurs the length of a bus wandered Australia And, if you’re interested in reading the research paper, which has been published in Historical Biology, the information is as follows: Anthony Romilio et al. Footprints of large theropod dinosaurs in the Middle–Upper Jurassic (lower Callovian–lower Tithonian) Walloon Coal Measures of southern Queensland, Australia., Historical Biology (2020). DOI: 10.1080/08912963.2020.1772252 Thanks, Robert -
Interesting discovery of a new theropod in South America: Overoraptor Chimentoi. Thought to be closely related to 'Rahonavis' from Madagascar; “...........would indicate that Overoraptor chimentoi and Rahonavis could form a new group of paravian runners, which would be closer to the birds than known raptor families.” http://www.sci-news.com/paleontology/overoraptor-chimentoi-08517.html
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Hi! Here is the second tooth I recently acquired. The information he had was It Was from the oldman formation in the red river valley Alberta. It is 3.5 cm on the long side with 3 serrations per mm.
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- alberta
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Hi everyone, Does anyone know where I might buy unprocessed fossil matrix containing Theropod teeth?
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I've got this long flat bone from the Kem Kem with a wide base, it was presumably attached to a larger bone. It also seems like it's missing the tip. I thought it might be a small spinosaurid neural spine but it has a weird lump of bone on one side so it seems like it is something else. Is this lump a muscle scar? Or a healed wound? And could this bone be an odd spinosaurid neural spine or is it something entirely else?
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Hello together, I think I may have asked about these before, posted together with other teeth. They were sold together with other fossils supposedly from kem kem, saying "teeth from Abelisaur/Dromaeosaur" which is not very helpful. Can any of you tell me more about them? Sorry if already got an answer for these, could not find one. Only the darkest one shows much of the serration, the sandy part may be repaired? @Troodon, @LordTrilobite, your expertise would be most welcome. @Abstraktum Thanks and greetings, J
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Hi! I recently got 4 vertebras from Morocco (Kem-Kem beds). They told me that one of them (the smallest one, nº4) is a theropod vertebra but I don't know what kind of theropod it comes from (or even if it is possible to know). And I'm completely lost with the other 3 (number 1 - 3), I don't know if they are Spinosaurus, crocodile or even a mosasaur... Can anyone help me? Thanks in advance!
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I've just cleaned up a big batch of Hell Creek bones and I'm struggling to ID a few of them. I have some ideas as to a few, but others I'm clueless (and I'm sure some won't be able to be ID'd beyond indeterminate dino/reptile bone). These four are all pretty big. The largest, second from the right, is just over 6.5 inches. I've attached a picture of that one before I repaired it as it has very thick walls. That bone and second from the left are very heavy for their size, so I'm assuming they're theropod (probably leg bones). I haven't a clue with the other two, but they're an odd shape.
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Hello, two more verts I'd quite like to add to my (slowly) growing vert collection. First is a a Kem Kem Theropod Caudal Vert mentioned as possibly Carcharodontosaurus which measures 7 cm x 7.5 cm x 7cm. Many thanks again.
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Hello, I'm new on this forum and I've got a fossil of which I don't know what it is so I thought I'd ask. It's from the Kem Kem. I don't know which formation but it comes from Taouz. Only one side has been preparated. I haven't preparated the other side because it's a pretty thin bone and I'm afraid it might break. It seems like it has broken and been repaired before. Also, there's an Onchopristis tooth attached to it. I think it might be a skull fragment because of it's odd shape. Specifically I think it might be some theropod's left postorbital of which only the inside has been preparated. But there aren't a lot of Kem Kem skulls to compare it to. So it might be something entirely else. Any ideas as to what it could be would be highly appreciated. Top view Front view
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Any thoughts on this? Another vert I'd like to add to my buy list. From Kem Kem. 17cm long. Dorsal vert. Is the spinosaur label good, or could it be carcharodontosaur? Or, croc? Also, tge brown line down the middle isn't something suspicious ? Like a sign of restoration?
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Hi this is a bone I just repaired originally from Morocco, it was broken into two pieces. Please can I have help to identify it. I am guessing Spinosaurus femur. Its 18 inches long, 2 inch diameter at the smallest point and 3.5 inches diameter at the widest, Thank you
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I was going to wait until tomorrow night to post the 3rd tooth but i got around to taking some pictures and measurements now so here is Unidentified Theropod Tooth #3. Judith River Formation Hill County Montana Crown height 15 mm ( broken base ) Serration count 17 per 5 mm distal 20 per 5 mm mesial I do not see a twist in the mesial carina This tooth is more compressed than the other two teeth the first being dromaeosaurus. Saurornitholestes perhaps?? @Troodon
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This is the second unidentified theropod tooth i just recently received. This tooth has a broken tip and its missing most of the mesial serrations. These are the measurements i observed followed by pictures for your own assessment. TOOTH 2 JUDITH RIVER FORMATION HILL COUNTY MT Crown height 12 mm ( missing tip ) Distal serrations are 3 per mm Mesial are 4 per mm There looks like there is a twist in the mesial carina Dromaeosaurus/Tyrannosaur?? @Troodon
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Whats up everyone!? So i just received 3 new " Unidentified Theropod " teeth . I will be posting 1 a night for the next 3 nights. All of these teeth were found in the Judith River Formation in Hill County Montana. Heres Tooth #1 Judith River Formation Hill County MT CH 16.5 mm 14 serrations per 5 mm on the distal side of the tooth 17.5 serrations on the mesial side of the tooth Twist present on the mesial carina My thoughts - Dromaeosaurus Albertensis..... Tell me what you all think? @Troodon
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Small unidentified theropod tooth from Morrison Formation, Wyoming
Sauroniops posted a topic in Fossil ID
Hello there. I recently received a small theropod tooth from the Morrison Formation, without any ID. Part of the tip is missing/worn out. At its longest dimension, the tooth measures 1,1 cm. The serration count (Both mesial and dermal) are 6-7 serrations per mm, and about 18-19 per 3 mm. Anyone who's got a good guess, feel welcome to drop a comment here, cause I have no clue if this is a baby Allosaurus, or a small Marshosaurus, Ornitholestes, Coelurus or something completely different.- 11 replies
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Possible Suchomimus or theropod toe bone from the Elhraz Formation?
msantix posted a topic in Fossil ID
Hi, Saw this for sale and was just wondering if this looks like a theropod toe bone or if it could be narrowed down? it is labelled as from Suchomimus but it could instead be from a croc or another theropod if not Suchomimus. It is 10cm in length and comes from the Elhraz Formation in Gadoufaouna, Africa. Thanks. -
Sadly the paper is paywalled https://www.sciencedirect.com/science/article/abs/pii/S1342937X20301234
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HI, I purchased this Unidentified theropod tooth a few years ago from a seller that sold it as a "Raptor" tooth. It is from the Kem Kem beds from Morocco, during the late Cretaceous Period. It is 1.3 Centimetres (1/2 inch) long. The seller also mentioned that it may likely be from an Abelisaurid. I think that it is most likely an Abelisaurid tooth and I am looking forward to updating it's identification tag in my collection. Yet I need to be certain that I am correctly identifying this tooth. What are your thoughts about what this tooth could be? I apologize if I spelled/addressed the names incorrectly and I would thank you for the correction. Feel free to ask for better quality pictures if you need any.
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Ok, I have given a go at doing some ID on this myself, using the very helpful "identifying theropod teeth from the Hell Creek/Lance Formation." thread. But hit a brick wall. So, if anyone could A) Let me know what this tooth is and B -- If I am on the right track with my amateurish ID attempts, that would be amazing. So, I got to eliminating it as being a Nano (Because Nano teeth are apparently rectangular and this is quite ovalish. And eliminating it as being a small version of a T-rex tooth because it isn't fat and the tip doesn't look right. And eliminated Archaeoraptor as it being a bit big. Eliminated Dakoraptor because the recurve isn't enough. This is my first time having a proper go at IDing a tooth for sale beyond googling similar--so odds are I've missed something obvious or got it completely wrong. So, it is labelled as theropod Nanotyrannus, Lance Formation, 0.5 inches in length. Any help, as always, much appreciated.
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https://www.nature.com/articles/s41586-020-2190-3 For your reading pleasure.
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I obtained a 1.5 inch tarbosaurus tooth from a very old collection decades ago. One that had not been prepped since the day it was collected. I decided to finally prep it and wanted to show you all the final product. Very happy. Amazing serrations.
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Digging through some bags of bones, looking for something to work on during the virus crisis. Glued the pieces I and collected and this is what I have. I believe this was collected in Wyoming, near Newcastle. What is it? I think it is Theropod, possibly a partial pubis bone. 10.5inches long, 1.5 inch flat bottom, approx 1 inch depth large marrow pores.
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- pubis bone
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Hello, this spring break I found this vertebra in late Campanian sediments from southern Coahuila, Mexico. It comes from the Late Campanian, Cerró del Pueblo Formation, around 73-71 million years. This was found along with marine and terrestrial fossils. It is about 1 cm long (3/8) of an inch, 1 cm in width, and 1.1 cm in height. I want to know what type of dinosaur this vertebra belonged to and whether it’s a caudal vertebra or not. My thoughts on this specimen at the moment, is that it’s probably a caudal (tail) vertebra from a small theropod dinosaur, something like a dromeosaur or a troodontid. I hope some dinosaur experts on this forum can give me more insight on this small vertebra.. Side view Other side Front view Bottom Top view
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Here are a couple of dinosaur teeth (tyrannosauroid and hadrosaurid) from Bladen County, North Carolina.
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- appalachiosaurus
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