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Showing results for tags 'late cretaceous'.
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Hello! Looking to ID this asian theropod tooth from the late cretaceous of Bayankhongor, Mongolia that is supposedly from Alioramus sp. The serrations are quite worn for this rooted tooth and are hard to see, the entire tooth measures 60mm Below I've attached some pictures, thanks in advance!
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Updated 1/17/20 I've taken a pretty firm position on the validity of Nanotyrannus ever since I spent some time looking at the Dueling Dinosaurs shortly after they were discovered. Subsequent to that, new information that I've become aware of just cemented my position. I'm interested in understanding the "truth" and have no problem looking at all available specimens that are in private hands or museums. The optics are very clear to me and I have difficulty understanding the debate. Collectors need to form their own opinion on this but I would like to share with you why I beli
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- lance formation
- nanotyrannus lancensis
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How variable are Hell Creek/Lance Formation crocodilian teeth?
Jurassicbro238 posted a topic in Questions & Answers
I've had these crocodilian teeth from Niobrara County in the Lance Formation for a while now, but I'm not sure how if its possible to ID them beyond "Crocodilian tooth." I've generally heard that the "sharp" morphology are Borealosuchus teeth and the short bulbous teeth are Brachychampsa. Is that a safe rule to follow? I've also noticed that there are some slight differences in the teeth I have (hopefully the pics make it visibile). They're small, but the two on the lower left have noticeable raised striations (not sure what to call it). However, the one on the lower right and on the top are s -
Hello! I was wondering if this is a soft tissue impression. The specimen is about 2cm long and I think the rock around it is sandstone. It was found in Niobrara County, Wyoming in the Lance Formation. I would like to know what you all think!
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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 sug
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Dinosaur & Croc Faunal List of the Hell Creek and Lance Formations
Troodon posted a topic in Questions & Answers
Edited (12/31/22) 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. 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- 30 replies
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- late cretaceous
- hell creek formation
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Triceratops Horn
FightingUrukHaii posted a topic in Is It Real? How to Recognize Fossil Fabrications
Purchased this piece in 2018, but now have concerns about its authenticity. Main area of concern is the base of the horn where the outer layer has chipped away to reveal a white-ish interior that looks a bit like cement/plaster. There is a slight glint to the white material. Any help is much appreciated + can upload more photos if necessary! -
From Upper Campanian strata in the SE Pyrenees (Catalonia-Spain), I’ve found this piece that defies my knowledge of the zone’s invertebrates, as neither its size nor its shape fits anything I know. It seems an ostreid to me because the laminar structure and smooth surface of the shell, but the ostreids in the zone I’ve learned to ID, such as Amphidonte pyrenaicum, Amphidonte pliciferum, Pycnodonte vesicularis, Hyotissa semiplana, Agerostrea ungulata and Rastellum sp. are very different. Some details: The shell form beekite rings, as the ostreids in the
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- late cretaceous
- se pyrenees spain
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Gently cleaning a tooth from the Moroccan phosphate deposits
Maniraptora posted a topic in Fossil Preparation
Hey all. I have an Igdamanosaurus agyptiacus tooth from the Late Cretaceous (Maastrichtian Stage) phosphate deposits of Morocco’s Oulad Abdoun Basin. It has one odd little spot with a maroon-covered gunk stuck to it, which I would like to gently clean off of it. The spot is on an area with intact enamel, right next to an area without enamel. First picture shows the spot I’m referring to, second and third are random pictures of this tooth, because why not? Fossil pictures are cool. It’s 1.27 inches wide if that matters, haha. -
Hello all, I bought a collection box (rikermount) for some of my late Cretaceous belemnites (Belemnitella and Belemnella (pachybelemnella) sp.). The fossils are 70-66 million years old (to be more detailed: 70-68 and/or 70-67 mya). Just like other fossils, belemnites can be stored quite well in this kind of vitrine/case. Also good for storing some shark teeth or other fossils like (flat) plant fossils/impressions. Other collectors that have rikermounts with fossils? (perhaps a picture?)
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Hi FF, I recently bought a "raptor tooth" that came from the Kem Kem beds in Morocco. I wanted to make an information card for it in the display (it’s a gift for a young paleontologist), but the description said “These small theropod dinosaurs from the Tegana Formation have yet to be described, primarily due to lack of articulated bone material having been found in the formation." Someone told me that it was most likely from an Abelisaur (rather than a raptor), and recommended that I ask for advice on this site. I'm just trying to find out more about the fossil and the best
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Hello everyone , I have been trying to identify this fossil for a while now, nobody seems to know. This is a fin spine from the upper cretaceous (campanian) of israel. Recovered from phosphorite rich marine deposits. It reminds me of hybodontiformes, but its different as it lacks their characteristic serrations, and by that time period they should have gone extinct in the ocean. Any help would be incredible!!
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The Judith River Formation - Tooth ID, Faunal List & Localities
Troodon posted a topic in Questions & Answers
More and more dinosaur material is becoming available from the Judith River Formation. I see lots of misidentified material and some with questionable localities that might fit other deposits. I would like to summarize what I believe is currently known and published. If you see any omissions or errors, please let me know. Not a lot of good maps out there to show the formation but here are two. In general, the exposures are in North Central Montana. Horner describes the formation on the western end is near the east end of the Sweetgrass Hills (very thick about 152 meters) and- 9 replies
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- late cretaceous
- judith river formation
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New long-necked polycotylid plesiosaur discovered in Wyoming
pachy-pleuro-whatnot-odon posted a topic in Fossil News
A new polycotylid plesiosaur has been recovered from the upper half of the upper member of the lower Maastrichtian (Late Cretaceous) Pierre Shale Formation of Wyoming: Serpentisuchops pfisterae, the snake-like crocodile face. The interesting aspect to this new discovery is that this polycotylid, contrary to most other known members of this clade (that is, all with the exception of the Turonian Thililua longicollis and Manemergus anguirostris from Morocco), has a elongated neck, convergent on those of elasmosauridae. The pertinent article can be found here: Scott Person-
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- plesiosaurs
- polycotylidae
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The Two Medicine Formation: Identification, Faunal Lists and Localities
Troodon posted a topic in Questions & Answers
More and more dinosaur material is becoming available from the Two Medicine Formation. I see lots of misidentified material and some with questionable localities that might fit other deposits. I would like to summarize what I believe is currently known and published. If you see any omissions or errors, please let me know Not a lot of good maps out there to show the formation but here are two. The TMF is about 650 meters thick and is the western equivalent of the Judith River Formation. Most of the sediments were deposited in streams, rivers and lakes. It overlies the Virgel- 1 reply
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- campanian
- late cretaceous
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My past two trips to Ramanessin Brook in Holmdel, NJ have been especially productive. Resulting in much larger teeth and much more diverse finds, Ramanessin has proven to be a much better spot than Big Brook for me. Here are the finds from the first trip: Many large anterior goblin shark teeth; a very large crow shark tooth; some very nice mackerel shark teeth; two pycnodont teeth; coral; a large ghost shrimp claw; a large ammonite fragment; a scallop with both shells intact; what I believe to be a fragment of a very large sawfish tooth (though it does seem especially stri
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- navesink
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I have been fossil hunting in the Monmouth County, NJ area for quite a few trips now, and I have accumulated a good amount of fossils I haven’t been able to ID. Here are some of them: Note: feel free to ask for more angles; I didn’t want to post too many images. 1 inch for scale Found in Ramanessin - no idea what it is Found in both brooks - 5 in middle look to be same species; I believe far-right is pycnodont or hadrodus Left - found in Ramanessin; think its coral Right - found in Big Brook; thought it was coral when I found it but I’m now leaning to
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went hunting in the late cretaceous marine severn formation an found something weird. Its not ironstone, shell or bone and seems large for shrimp burrow. Could it be a coprolite?
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Hoping this is something different as it's unlike any other tooth I've found there. More conical. A little worn. Any chance a plesiosaur!!! Thanks so much!!
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This one has me a bit stumped. It's pretty tiny. Sorry for forgetting the measuring device but its 3/8" or 9.53 mm. I've researched the heck out of it and have no hollow teeth from there let alone this small? Thanks so much!!
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The Two Medicine Formation is a late Cretaceous geological formation that was primarily deposited in North Central Montana 84 to 71 million years ago about the same time as the Judith River Formation, See Map - pink area. The Two Medicine is found along the east flank of the Rocky Mountains and represents the upland area of the Cretaceous Seaway while the Judith River Formation represents the lowland area. Although deposited in the roughly the same period the Two Medicine has yielded an amazing list of dinosaurs that are not found in the Judith River. These include Einiosaurus procurvicornis,
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- two medicine formation
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Found this in Big Brook, NJ (Late Cretaceous Navesink Fm.). It's about 2.5 cm wide. I don't even know what phylum to put it in. My first thought was bryozoan. There is one very thorough paper on Bryozoa of the Atlantic Coastal Plain, but it has nothing to fit the bill. Looks like sponge with those big holes. Found a picture of Discopora sp. that looks very close, but that genus is not listed in PBDB anywhere in North America. Gabb thought he had something similar from NJ, but it turned out to be a sand concretion. The last picture is the underside of the specimen, which may or may not be a thi
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- invertebrate
- porifera
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I noticed this fossil in the limestone at the base of the great pyramid whilst on holiday. Reading online there are quite a few Nummulites in the rock of the pyramids themselves but not much information on larger finds and unlike the quarried and transported stone of the pyramids themselves this was seemingly part of the natural giza rock forming base around the structure. Im very much an amateur at this but out of pure interest I was wondering what you all may think of it?
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- eocene
- mokattam formation
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It has been some time since I posted anything of note. I'm still adjusting to my new surroundings here in Colorado but I did at least join a local Paleontological Society (WIPS) Western Interior Paleontological Society. My first field trip with the group was out to Baculite Mesa in Pueblo, CO. A location that is famous with a storied history, that is still giving up its ancient treasures. The weather here in Colorado can be touch and go at best, and our trip was almost delayed/cancelled by a late winter storm. This was our neighborhood in Denver the day before the trip. But temperatures
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- baculites
- western interior palentological society
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Identifying Theropod Teeth from the Two Med Formation
Troodon posted a topic in General Fossil Discussion
Identification of theropod teeth from the Two Medicine formation is always a challenge even for the more experienced collector. Sellers whether its a dealer or auction site also struggle with identifications and sometimes just shotgun it. So I decided to put this together as an quick aide in providing you some information. Among the sources used is the reference book Dinosaur Systematics by Ken Carpenter and Phillip Currie... its an excellent reference source. This aide is for the more common teeth collected and sold, not for more obscure theropods. I'm sure mistakes/omissions have been made,- 6 replies
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- late cretaceous
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