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Showing results for tags 'maastrichtian'.
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Looks like Abelisaurid week in south america A new Abelisaurid is described here from the late Cretaceous of Argentina : Niebla antiqua For those collectors that have abelisaurid teeth from Argentina this species just adds to the complexity in trying to identify isolated teeth unfortunately its paywalled https://www.sciencedirect.com/science/article/abs/pii/S0895981120304582 Got some better photos
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I was recently reorganizing my fossil collection and thought I would share some pieces I collected during Paleontology field trips in undergrad at Alabama. I'm glad I took thorough notes at the time! The demopolis chalk is a popular formation for finding Exogyra/ostrea/pycnodonte shells and shark teeth. We visited a site in Tupelo, MS many times for surface collecting. Some of the cool pieces I found were many fragments of a mosasaur jaw (top pic, top 2 slots), a Squalicorax kaupi tooth, a scyliorhinus(?) tooth, bony fish vertebrae, and bony fish teeth. I was told the dark fossils at the right of the third picture might be ray plates, but I'm not sure. Turritella in pic 1 are from a different formation.
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- alabama
- athens shale
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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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- hell creek formation
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Fossil of giant 70 million year-old fish (Xiphactinus) found in Argentina
Oxytropidoceras posted a topic in Fossil News
Fossil of giant 70 million year-old fish found in Argentina (PhysOrg) De Pasqua, J.J., Agnolin, F.L. and Bogan, S., 2020. First record of the ichthyodectiform fish Xiphactinus (Teleostei) from Patagonia, Argentina. Alcheringa: An Australasian Journal of Palaeontology, pp.1-5. (Researchgate PDF) Yours, Paul H.- 2 replies
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- argentina
- chubut province
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Shell preservation. Complete with mouth aperture.
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Hello all, I collected this tooth last weekend along the Red Deer river in Alberta, and would like to know if it's possible to differentiate it as either A. sarcophagus or T. rex. I'm about 90% sure that it's from a deposit of the Horseshoe Canyon Formation, but the region also has exposures of the Scollard which introduces the possibility that this is from Tyrannosaurus. I had to leave the tooth with a friend until I can apply for a disposition certificate, so I can't get any additional photos, but I made a point to get pics of the major diagnostic features used to ID theropod teeth. Denticle spacing is 0.5mm, or 2 per millimetre: Thanks.
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- campanian
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From the album: Cephalopods Worldwide
8cm. nicolletii zone Maastrichtian Late Cretaceous. I picked this up for a song recently on our favorite online auction house. I had to finish off the prep and do a small bit of modelling at the venter. The seller had no idea about the location, not even the state, but that really doesn't matter to me. I'm just happy to be able to add another of these gorgeous ammonites to my collection. -
From the album: Pisces
5.5cm. long. Late Cretaceous Maastrichtian From Qued Zem, Khouribga, Morocco -
Over twenty years of work on the Hanson Ranch Bonebed in the Lance Formation of eastern Wyoming has yielded over 13,000 individual elements primarily of the hadrosaur Edmontosaurus annectens. Findings are presented in this paper. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0233182
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- edmontosaurus annectens
- lance formation
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Need help in identifying problematic fish bone
The Amateur Paleontologist posted a topic in Fossil ID
Hey everyone Hope you're all doing well! While looking through unprepped/untouched blocks of chalk from last year's fieldwork session in the Late Cretaceous of Møns Klint (Denmark), I found one block that showed a little trace of fish bone. I scraped a bit around it with some dental tools, and managed to reveal the whole fossil. And I'm having quite some trouble identifying it... Could anyone help me? I've included pics and details of the specimen below. Pics: Note especially the 'ridges' in the upper half of the fossil Full details: -Location: Møns Klint, Isle of Møn, Denmark -Stratigraphy: Occidentalis belemnite zone, Hvidskud Member, Møns Klint Formation, White Chalk Group. -Age: Upper part of Lower Maastrichtian, Late Cretaceous; ~70 million years old -Measurements: ~5mm largest width; ~4mm height -Possible interpretations so far: partial fin element, partial scale. Most recently, I considered it to be the partial scute of a Dercetidae fish (based on Wallaard et al. 2019 and Friedman 2012)... But I'm really unsure... Taken from Wallaard et al. 2019 Taken from Friedman 2012 I'd be really grateful for any help identifying my specimen
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A new domaeosaurid, Dineobellator notohesperus, consisting of a partial skeleton from the Upper Cretaceous (Maastrichtian) of New Mexico, the first diagnostic dromaeosaurid to be recovered from the latest Cretaceous of the southern United States. The holotype includes elements of the skull, axial, and appendicular skeleton. From the Ojo Alamo Formation Dineobellator notohesperus Article https://phys.org/news/2020-03-feathered-dinosaur-surviving-raptors.html Smithsonian Mag. Article https://www.smithsonianmag.com/science-nature/dineobellator-dinosaur-new-mexico-180974511/ Paper https://www.nature.com/articles/s41598-020-61480-7
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- dineobellator notohesperus
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From the album: Maastrichtian Shark Teeth, Volgograd Oblast, Russia
Squalicorax pristodontus (Agassiz 1843). Slant length indicated by longest side. -
From the album: Maastrichtian Shark Teeth, Volgograd Oblast, Russia
Cretalamna sp. (Glikman 1958). Slant length indicated by longest side. Listed as Cretalamna sp. due to C. appendaiculata being a wastebasket taxa. I am unsure if this certain locality has its own designated species. -
From the album: Maastrichtian Shark Teeth, Volgograd Oblast, Russia
Cretalamna sp. (Glikman 1958). Slant length indicated by longest side. Listed as Cretalamna sp. due to C. appendaiculata being a wastebasket taxa. I am unsure if this certain locality has its own designated species. -
From the album: Maastrichtian Shark Teeth, Volgograd Oblast, Russia
Squalicorax pristodontus (Agassiz 1843). Slant length indicated by longest side. -
From the album: Maastrichtian Shark Teeth, Volgograd Oblast, Russia
Cretalamna sp. (Glikman 1958). Slant length indicated by longest side. Listed as Cretalamna sp. due to C. appendaiculata being a wastebasket taxa. I am unsure if this certain locality has its own designated species. -
I found this today in the Ripley Formation (Late Cretaceous (Maastrichtian) of ne Mississippi. Am I right in thinking it’s a crab finger? Which one? Thanks. coin is 19 mm in diameter.
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- anomura
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I found this today in the Ripley Formation (Late Cretaceous (Maastrichtian) of ne Mississippi. Am I right in thinking it’s a fish vertebral element? Which one? and if so, why the mushroom top? Coin is 19 mm in diameter.
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Birthday fossil hunting trip (Cretaceous of Belgian & Dutch Limburg)
ziggycardon posted a topic in Fossil Hunting Trips
Hello everyone, Yesterday my girlfriend & I went fossil hunting for birthday. This was the first fossil hunt the two of us did on our self, our previous hunts were all excursions with the Belgian Association for Paleontology. We visited two locations, but locations are part of the Formation of Gulpen, around 68 million years old, dating back to the Maastrichtian (these outcrops are part of the Maastrichtian type location where the first mayor Mosasaurus discovery was done). The first location we visited was a limestone outcrop next to the Albert Channel here in Belgium, only a 20 minute drive away. I discovered this outcrop while looking out the window whenever I drive to Maastricht and yesterday we decided to check it out. It is quite a little outcrop, no more than 70 meters wide, but one of the few places left where you can hunt in Limburg. We hunted here for around one and a half hour and we only searched the fallen and loose bits of limestone that were the results of erosion. We didn't want to start hacking in the rock. We mainly found ancient sea shells of different species and some bryozoa's in this location. And a some pieces of wall where teeming with urchin fragments, but we didn't find any intact one near the surface. But since the urchin graveyard was deeply enbedded in the rock and we didn't want to hack in it, we left it as it was The second location we visited was the "Grote Bos" in Beutenaken in The Netherlands. Here there are holloways in the forest that expose some limestone outcrops. This spot is known for it's belemnite which can be found on the forest paths, because the soft limestone gets eroded but hard belemnites remain, making them very easy to find. We found around 25 belemnites during our 1 hour hunt there as well as a shell imprint and a mystery fossil. Like the previous location, the patch of limestone where these belemnite can be found is also only around 70 meter long, but luckily very rich.
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Møns Klint fossil reptiles - size comparison chart
The Amateur Paleontologist posted a topic in General Fossil Discussion
Hey everyone - hope you're all doing Just thought I'd share with you guys a chart I made, comparing the sizes of various marine reptile species known from the Maastrichtian chalk of Møns Klint (~70 million years old - Hvidskud Member of the Møns Klint Formation). For now, there are only 3 reptile species known from MK. But who knows, that number might increase now that more in-depth collection and research is taking place over there Anyways... onto the size comparison chart - here it is: Details: The Mosasaurus hoffmannii is known from one very well-preserved pterygoid ('palate') tooth crown (belongs to the Danish Museum of Natural History/NHMD, but on loan to the GeoCenter Møns Klint/GCMK). M. hoffmannii is estimated to have reached ~17 metres, though the one in this chart represents a smaller-sized individual (~12m). The M. cf. lemonnieri is known from an excellently preserved tooth crown (belongs to NHMD but on loan to GCMK). Other fragmentary, eroded mosasaur teeth (2 or 3) are known from Møns Klint, and they might belong to either M. lemonnieri or M. hoffmannii The possible Thoracosaurus (crocodylian) is known from a partial mandible, with 2 tooth imprints associated (I'm currently describing that fossil, and soon hope to have the paper sent for publication ) Known remains are shown in white (teeth for the mosasaurs, partial mandible for the crocodile). Note: the reptile outlines are not mine, I modified them from some that were made by DeviantArt users paleosir and PWNZ3R-Dragon. Hope you liked this size comparison chart! -Christian
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- crocodylia/thoracosaurinae
- hvidskud mb./møns klint fm.
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Hi, This is found in 500-1000µm residue of marine sedimentation deposit in the Maastricht area. The deposit is known to occasionally have terrestrial animals present in it. I was wondering of what animal this jaw could be. The size is roughly 900 µm. Kind regards, Arno
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- cretaceous
- maastrichtian
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Hello dear users of the Fossil Forum! Please help me to identify the fossil. I'm inclined to think it's a cuttlefish Gladius. Am I right? LOCATION: Russia, Volgograd city area GEOLOGY: Upper Cretaceous Series, Maastrichtian ASSEMBLAGE: the Finds in this place are shark teeth: Squalicorax pristodontus (Agassiz, 1843), Pseudocorax affinis Agassiz, 1843, Palaeohypotodus bronni (Agassiz, 1843), Cretolamna appendiculata (Agassiz, 1843) DISCOVERY: the Gravel bed. Thank you. https://youtu.be/Rt_Cqyl0yA8
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From the album: Pisces
Front jaw section. 3x4.5x2cm. Maastrichtian Late Cretaceous From Khouribga, Morocco-
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From the album: Vertebrates (other than fish)
10x12mm. Tooth. Obtained on a trade with Strepsodus. Lance (Creek) Formation Maastrichtian Late Cretaceous Weston County, Wyoming, USA -
Last weekend Natalie and I went on a city trip to Maastricht in the Netherlands. After a 2h drive and a tour in the city we went to visit the "Natural History Museum of Maastricht" The museum in itself is relatively small , but there are plenty of Maastrichtian fossils on display. Of course the famous mossasaurs and turtle fossils, but also lots of display cases with invertebrates of all kind from the Maastrichtian marls in the area. There are also a lot of volunteers working there to work on recent discoveries and to talk to the visitors about those prepparations .
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- cretaceous
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