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Showing results for tags 'maastrichtian'.
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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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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. -
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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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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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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This topic is a short continuation of my previous topic on my Squalicorax collection, which can be seen here: This time I have chosen to show my Pseudocorax teeth. As with the Squalicorax teeth, I am open for trades and buying new additions. The oldest examples of Pseudocorax in my collection come from the Lower Campanian. Like the Squalicorax genus, they start off as a genus with very small teeth. Pseudocorax granti (x16) Ozan Formation Lower Campanian Moss Creek, Fannin County, Texas, United States of America See you guy tomorrow, Sander
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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. -
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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Hello forum members! With the new Coronavirus raging across the world, I thought it would be nice to start some kind of advent calendar, using my own Squalicorax collection. Everyday I will post one or multiple Squalicorax teeth from one location. Let's see what ends sooner, my collection or the virus outbreak. I will start with the oldest tooth from the Albian substage and end with the teeth from the uppermost substage; the Maastrichtian. The first one is the oldest and also one of the smallest teeth in my collection. Unfortunately it is so small that the photo's are not as sharp as I would have liked, but I think they are good enough. It is Squalicorax primaevus from the Middle Albian Argiles tégulines of Courcelles, Aube Department, France. See you guys tomorrow, Sander
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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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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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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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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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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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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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Late Cretaceous chalk in North America
The Amateur Paleontologist posted a topic in General Fossil Discussion
Hey everyone I know I've been lately rather inactive on TFF; I was held back by fieldwork and other reasons (though do expect some posts about the fieldwork next weekend ). But anyway, onto what I came to talk about... Would anyone know of some good exposures of Late Cretaceous chalk in Canada or USA? I'm thinking specifically about Campanian chalk or, even better, Maastrichtian chalk.. It would be great if the exposed chalk is very fossiliferous, of course. Thanks for any help! -Christian -
Phalange III-1 of the left foot of a hadrosaur, likely Edmontosaurus. Has some dorsoventral crushing and repair.
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