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Showing results for tags 'hell creek formation'.
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Hi all, I came across this Ceratopsian tooth from the HC Fm. online and was wondering what you make of the 'wear facet' on the root? Did this occur naturally in the jaw while the tooth got disposed of? I have not seen this before so I am curious Thanks in advance!
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Hello! I got this dinosaur vertebra from Hell Creek (Montana) a few years back. It was sold to me as a Triceratops vertebra but I don't know how that ID was made. It's not in the best condition (has moss(?) on it and has been broken and then glued back together) but it is about 13-14 centimetres across so it is clearly from a big dinosaur, but there were plenty of those in Hell Creek (even two large ceratopsids - Triceratops and Torosaurus). Looking for any insight into how an ID could be made here and if Triceratops (or even just ceratopsid) is correct
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From the album: Dinosaurs
A high-quality replica of Stan's posterior right dentary tooth. About 4.5" in length. -
From the album: Dinosaurs
Distal serrations of a juvenile Nanotyrannus lancensis (Hell Creek Fm., Dawson Co., MT). -
Identification: Originally listed as a Dromaeosaurid tooth, I suspected it was from a Tryannosaurid. Upon receiving the tooth, I contacted a few paleontologists to get expert opinions. Their conclusion was that the tooth was likely from a baby/juvenile Tyrannosaur. Since the only Tyrannosaurs in the Hell Creek Formation are Tyrannosaurus rex and Nanotyrannus lancensis (or only T. rex if N. lancensis is a young T. rex), and considering the cross-section of the base of the tooth, this must be from a baby Tyrannosaurus rex. This tooth shares many qualities with adult teeth, a fact which the experts used to justify their identification. The large denticles (serrations) on both carinae (cutting edges) are similar in shape and size, there's virtually no recurvature, no twisting of the carinae, and it has an oval base. The overall shape of the tooth also suggests that it's from the posterior region of the mouth. Among the attached photos are juxtapositions with a high-quality cast replica of an adult T. rex (Stan) posterior tooth, and a juvenile N. lancensis tooth (also from the Hell Creek Formation). Other: Mesial Serration Density: ~ 5.5 - 6 serrations / mm Distal Serration Density: ~ 5 - 5.5 serrations / mm Note: Serration density alone is not an identifying feature of Tyrannosaur teeth this small. Identifiers: The people that support this identification are: @Troodon (experienced and knowledgable collector on TFF); Dr. Philip J. Currie (noted paleontologist, museum curator, and professor specializing in Tyrannosaurs); Dr. David DeMar Jr. (research associate in the Department of Paleobiology of the National Museum of Natural History, Smithsonian Institution); and Dr. Christophe Hendrickx (postdoctoral researcher specializing in the evolution of theropod dentitions). Citation: OSBORN, HENRY, 1905. Tyrannosaurus and other Cretaceous carnivorous dinosaurs, Bulletin of the AMNH, Volume 21, Article 14, Pages 259-265, https://digitallibrary.amnh.org/handle/2246/1464
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Hello! My name is PaleoZ and I live in North Dakota, U.S.A. I live in the famous Glacial Lake Agassiz deposit. Here in the surrounding fields I have found fossil shell imprints, soft bodied marine animals, nautilus shells, and a couple other of unidentified fossils that are very indistinct. My two most favorite geological formation are the Hell Creek Formation and Kem Kem Beds of Morocco. I have found and collect and variety of fossils from U.S.A, Madagascar, Morocco, Canada, and many unknown location fossils. I love pretty much anything fossil related and if you have a cool new fossil, I would love to see it. Every Fossil has its Story. Keep hunting and exploring the world. Sincerely PaleoZ
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Every few years we get rewarded with a new dinosaur described from the Lance/Hell Creek Formations. In this crazy year we finally have one. Finally an Alvarezsauridae has been described from the Hell Creek Formation: Trierarchuncus prairiensis. Sorry its paywalled cannot make comments https://www.sciencedirect.com/science/article/pii/S0195667120302469 Here is some info on this very different dinosaur, one of my favorites, including some of my material so you can see what the paper is describing. Far better than what you see in the paper
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The skull of any dinosaur is composed of many different elements. When I go collecting in an Edmontosaurus bonebed one never finds a skull but the elements that make up one up. Like to use this topic to share the complexity and variety of some of the elements I have collected. I do not have many but will post the ones I have and will continue to add as I prep or find them. Of course if anyone sees any discrepancies please feel to comment and like to thank Olof (LordTrilobite) in the ID of some. Skull still in a jacket not from my usual bonebed but one can see it all together. One day I'll get it mounted. To aid in identification of where SOME these elements are located have this illustration that comes from Marsh's 1893 This is a Saurolophus skull but elements are the same QJ: Quadrotojugal PMX: Premaxilla L: Lacrimal SA: Surangular SQ: Squamosal PO: Postorbital EO: Exoccipital Dentary (Less Teeth ) The Maxilla Surangular Squamosal Quadrotojugal Exoccipital Quadrate \ Splenial
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Hi everyone, I just got this tooth from the Hell Creek Formation of Carter County, Montana. It was labeled as Richardoestesia, so based on the curvature, I was assuming the proper ID would be cf Richardoestesia gilmorei. However, when taking some measurements, what caught my eye was that the mesial carina appeared to end 1/3 from the base, and I started to wonder if instead this tooth could possibly be Dakotaraptor. These are the measurements I was able to get: Mesial: around 5.5-6 serrations/mm Distal: around 5 serrations/mm CH: around 16.5 mm CBL: around 7 mm CH/CBL: around 2.4 The crown appears to be smooth, the base is almond shape, and I believe the denticles have rounded tips. Please let me know what you all think. Also, some of the measurements may need double checking. Thanks!
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From the album: Dinosaurs
A tooth from a juvenile Nanotyrannus lancensis. Only missing the very tip.-
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From the album: Dinosaurs
Hadrosaurs evolved very interesting teeth and complex mastication. Read "Complex Dental Structure and Wear Biomechanics in Hadrosaurid Dinosaurs:" https://science.sciencemag.org/content/338/6103/98-
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I was very happy to see that recent publication that finally described the youngest known alvarezsurid Trierarchuncus prairiensis from the Hell Creek Formation. Material is rare but is most commonly overlooked and described as Croc or unknown theropod so knowing what to look for helps. I'm constantly on the lookout for this material and have been for years and have been fortunate to either find it or be able to acquire it over time. I used publications of other Alvarezsauridae like the Asian Mononykus and Canadian Albertonykus to help in the identification of my specimens. The paper is pay-walled but I included it for reference purposes. https://www.sciencedirect.com/science/article/abs/pii/S0195667120302469?via%3Dihub Extremely rare associated material found in SD
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Late Cretaceous mammal fossils from North America
The Amateur Paleontologist posted a topic in Questions & Answers
Could someone help me find PDFs of scientific papers about mammal fossils from the Campanian-Maastrichtian of North America? I'm specifically interested in papers that deal with mammal faunas from the Hell Creek Formation, the Lance Formation and the Dinosaur Park Formation... Thanks for any help Christian -
The discovery of the Tyrannosaurus rex led by a team from the Burke Museum made news last year. I've attached some photos of the preparation of the skull provide by the Burke Museum to show their progress with this dinosaur They have named this animal "Tufts-Love Rex" after Jason Love and Luke Tufts, the two volunteers who discovered it. Lower Jaw is exposed from its tomb. What a beautiful set of chompers The Skull is next. Maxilla More will follow as work continues..... @Pagurus
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Theropod Metatarsal ID request Verification
TyBoy posted a topic in Is It Real? How to Recognize Fossil Fabrications
Looking for confirmation on this theropod bone being sold. Seller is identifying it as a theropod (Anzu?) Arctometatarsal from the Hell Creek of Montana, Powder River County.. 10.4" Long. They indicate it cannot definitely provide an ID but the giant raptor Anzu Wylie is a likely candidate be cause other material from this theropod has been found at the quarry. What is a Arctometatarsal?
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Hi all, I posted this tooth for ID a while back. Conclusion was that it could be a Dakotaraptor, maybe, maybe. Since then I am going back and forth on the ID, basically on a daily basis So I decided to take more & new images, measure it thoroughly, put it up again, and kindly ask for your help. It was found in the Hell Creek Fm, Powder River Co., Montana. Measurements are: CH: 2.08cm CBL: 0.8cm CBW: 0.42cm Serration count per 5mm is mesial 24 and distal 18. What makes it hard for me to judge: the shape of denticles is between round and chisel (?), the tiny mesial denticles, and the position of the carinae. Lowest part of the mesial carina is sheared off, but I would not expect a twist - looking closely it would end either half way or 1/3 from base. Any help is highly appreciated!
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Hey everyone i hope you all had a great holiday season....this next tooth in my collection was labled saurornitholestes from the hell creek formation from powder county MT. We know that the only two described raptors from there are dakotaraptor and acheroraptor so im curious to see what you all think of this one. Nanotyrannus perhaps? Unfortunately the anterior serrations have worn off which im sure will make id'ing this tooth difficult but anyway here it is. ....the CH is 9 mm the posterior serrations are 12 per 3 mm. @Troodon
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Hey everyone, I came across these teeth online; They're being sold as an Acheroraptor teeth, but seemed odd to me and reminded me of some recurved Pectinodon teeth I had seen elsewhere (given their small size, too). [Tooth 1] The tooth was found in Hell Creek deposits in Carter County, Montana. I edited the seller's images together to make some features more visible. Its total height is 5mm; the serration density I measured is around 6/mm; Scale bar is 4mm. [Tooth 2] The tooth was found in Hell Creek deposits in Powder River County, Montana. Its total height [?] is around 4mm; Since there was no exact scale reference I couldn't edit in a scale bar. Thanks for any help with this!
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Hey everyone! In this post im going to be sharing two teeth from my collection. The first one was sold to me as acheroraptor. Its from the Hell Creek formation in MT and its CH is 7 mm. @Troodon
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It has taken 10 and a half months but I can finally start putting together our large display of the Hell Creek Fauna. I am really quite excited to start putting it together. We have a pretty good cross section of critters and I think it will be an excellent display to show the diversity of the formation. I also think this will be a great display to use as we explain how different animals share an ecosystem which is a science standard we want to get into more with the 2nd and 3rd grade students. I delayed starting this until we had tracked won three key fossils we were missing, Leptoceratops, Pachycephalosaurus, and Denversaurus. Those three have all gotten crossed off the list in the last month or so with the final domino being Denversaurus. We are still missing a Pectinodon tooth but we can add that down the road. I think now is the time to put it together so we can use this display for our presentation in Paradise which comes shortly after the year anniversary of the Camp Fire which burned the city down. It is a special program at the newly rebuild elementary school I will add some pictures of all the fossils in their individual displays later and once it is all living in one display. I am really proud of this one and I want to give a huge thanks to @Troodon who helped us immensely with this formation. Here is the Denversaurus tooth that I just picked up. A pretty nice tooth and a decent price at that. Today has been a good day for us as this is the one we needed to finish this up right !
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Searching for Hell Creek Formation micro sites/micro lenses
MarcoSr posted a topic in Fossil Hunting Trips
My sons and I have been searching different formations in MD/VA for many years so we know how to recognize the different formation layers and have a good idea where to find/or at least check for micro sites/micro lenses. My sons have also been collecting the Eocene/Oligocene formations of Nebraska for years so again they know how to recognize the formation layers. My younger son Mel moved to South Dakota in 2018 and began to also collect the Lance Formation and Hell Creek Formation. However he is still learning the different formation layers. His interest is dinosaur fossils from these formations. My interests are the much smaller micro dinosaur fossils as well as the micro mammal, squamate, amphibian, and fish fossils. I’m always bugging him to send me micro matrix. He sent me matrix this Fall. This post is about one batch of matrix. Mel’s first approach was to send matrix from small areas that have high density surface concentrations of teeth and bones. Where Mel is collecting is more flat and rolling with different Hell Creek layers exposed on the surface versus bluffs and small cliff faces. Mel for Thanksgiving sent me a large USPS priority box of matrix (around three gallons) from a small 6 ft. by 6 ft. area that had a high concentration of dino teeth on the surface. Although sand/clay based this matrix was hard as concrete. I had to use a rock hammer and a small hand sledge hammer to break what he sent into more manageable pieces (definitely not recommended if you are looking for larger specimens). That said the matrix broke down completely in a single day in buckets of very hot tap water and dawn dish soap. I would every few hours use finger pressure to help break up clumps. There was very little residue left after breakdown of this matrix. The below picture shows the residue from about 1/3 of the matrix or around a gallon. The below picture shows what I found. On the left maybe some petrified wood? Doesn’t really look like bone. Maybe geologic. In the middle there is a really nice Croc tooth (4mm), seed (5mm) (maybe modern?), and a partial gar fish scale (7mm). On the right there are several definite small bones and a few specimens that could be bones. Looks like a terrestrial/fluvial environment. What I found was nice but not worth the effort to remove the matrix, send it to Virginia, break the matrix down, and then to search it. Although like I said earlier, there was very little residue after breakdown, so it took only about 15 minutes to search all of the residue. Sampling different sites/layers and trial and error can be extremely tedious and non-productive if you really don’t understand the formation layers and how to recognize them in the field. So I reached out to a TFF member for advice and insight. He explained the matrix types and gave advice on where to take matrix samples. Taking matrix from areas with high density surface concentrations of larger fossils is one way to sample for micros like Mel did for this matrix. However TFF member cautioned that lots of times these concentrations of larger fossils got washed from another layer to the current area years ago and that the underlying layer may not contain much at all as seemed to be the case with this area/layer for this matrix. When you find a good micro site/layer it is very rewarding in the micros that you can find but these sites/micro layers can be difficult to find especially if you don’t have a lot of experience with the Formation. If anyone reading this post has any advice or insight for looking for a Hell Creek Formation specific micro site/layer please post it in a reply. Marco Sr.
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I try to get out dinosaur collecting twice a year and this year has been very good to me. Here are some quick field shots of SOME of my finds for this fall. I have a big prep job in front of we but I also use someone in Hill City to do some of my complicated work. Sites are in Montana and South Dakota all from the Hell Creek Formation. My Spring trip post have more specifics on the localities. My best find of the trip occurred on day 3 in Montana a complete dentary (lower jaw) with teeth of a Ceratopsian most likely Triceratops sp. The field photo show the jaw with lots of matrix around it to protect the sheath and teeth.. The jaw layed perfectly for me with teeth side up and flat so it made collecting easy. Here is an initial look at the jaw. The bone area in the middle is actually a sheath that is covering battery of teeth. Not all the teeth are covered by the sheath those in the far right are exposed and you can see the center ridge poking out, red circles. Prepping will expose them. Length 25" (65 cm) sorry did not brush it clean before the photo In addition to the one above I found two Hadrosaur jaws in SD from an Edmontosaurus. Both jaws are laying vertically, teeth side in against the wall. Typically they do not have teeth but until the prep is complete hard to say. One was from a Juvie about 20" (19 cm) and the other from a very young animal +13" (33 cm) which is pretty rare for this site. My initial view of the larger one was to expose the ascending ramus ( hinge) Here is the small jaw - preservation of the hinge area was not good but needed to collect it because of size. No teeth present.
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This was on several twitter paleo pages, posted this morning by several paleontologists. Comments and photos are that of the of North Dakota Geological Survey's Paleontology protection program. 2014 article https://www.theguardian.com/us-news/2014/oct/21/dakota-ducbkilled-dinosaur-home-bismarck This was the old "Dakota" exhibit. It was meant to be temporary. The arm is the piece on the bottom edge. It was previously displayed with the palm up, and this side was not well prepared and wasn't exposed before. This is indeed a portion of "Dakota" the Dinomummy, which is part of the North Dakota State Fossil Collection. We are currently working on cleaning this specimen for a new exhibit to open Feb 2020 People were confused at exactly what they were looking at here, so we've thrown together a little guide to explain how the bones of the hand relate to the fossilized soft tissue. Yes, digit III has a large 'hoof-like' nail, and much of the hand is encased in 'mitten' of skin. What this means is that the fingers could not really move independently that much, but acted more as a single unit. The tiny pink finger (digit V) is reduced and had no nail. Note: these images are "in progress" images. More work has been completed since they were taken Tail skin
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Hey everyone, I recently came across this fossil online. It was listed as a metatarsal joint fragment, which to me checks out, but the person further identified it as a Dromaeosaurid [though they didn't specify based on what characters] and tentatively assigned it to Dakotaraptor based on size. Now I was wondering: Can remains this fragmental even be reliably distinguished from the other small- to medium-sized theropods in Hell Creek? The fossil was found in Hell Creek deposits in Wyoming [no info on the exact location], measures 30.9 x 27.5mm [not specified along which sides], and weighs 252 grams. Thank you for any input on this!
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Hey everyone, I recently purchased this toe bone and the seller identified it as an Edmontosaurus, but now I’m thinking it might be a bit to big to be Edmontosaurus. I was thinking it might be from a bigger animal, like Tyrannosaurus Rex. The bone is about 4 inches long and 2 inches wide. It was found in the Hell Creek Formation in Montana. Any help is appreciated! Thanks!
