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To pass some time I've been recently researching early Paleocene life and I keep coming back to researching (in my view) the two strangest and controversial Late Cretaceous-Early Paleocene Formations I know of. These are the Hornerstown Formation dating 66.5-65.5 Million Years ago in what is now New Jersey, U.S. And the Takatika Grit Formation dating 66.5-60.0 Million Years ago in what is now the Chatham Islands, New Zealand. https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=0b3baee9ab1afc7973337f5047495b723fcfa4f2 https://www.researchgate.net/publication/315461615_The_age_of_the_Takatika_Grit_Chatham_Islands_New_Zealand https://www.sciencedirect.com/science/article/abs/pii/S0195667109000184?via%3Dihub I've read many reports about these formations and the pretty controversial stuff that's been found in both these areas (Paleocene ammonites and reports of archaic marine reptiles like Paleocene Mosasaurs). I'm really not 100% sure what to make of this as I've heard conflicting hypotheses on whether these more archaic marine reptile fossils were reworked from older formations while others say it's not too too likely? https://www.cambridge.org/core/journals/journal-of-paleontology/article/abs/maastrichtian-ammonites-from-the-hornerstown-formation-in-new-jersey/4F051D07668B7B893EEFECF0506E2F1B https://bioone.org/journals/acta-palaeontologica-polonica/volume-57/issue-4/app.2011.0068/Short-Term-Survival-of-Ammonites-in-New-Jersey-After-the/10.4202/app.2011.0068.full For most of these "controversial" specimens, I would say reworking is likely while some I'll admit I'm not sure? For the Mosasaurs, it's clear that the astroid impact 66 Million Years ago caused their total extinction, but I'm still not 100% convinced that none emerged from the event alive (at least barely) and swam the seas in the very first days of the Danian Paleocene but not too long after. Unlike the mostly terrestrial Non-Avian Dinosaurs, which could only hide in so many places and it's very unlike more than a tiny amount of individuals (not enough to support a population) made it into the Paleocene, the Oceans have slightly more areas to hide and more even for endothermic air breathing animals like Mosasaurs (though as an endotherm, food does become a major issue especially when the ocean food chain nearly collapsed completely). What I'm wondering is how valid are at least "some" of these supposed archaic marine reptile and ammonite fossils from the earliest Paleocene sections of the Hornerstown Formation and the Takatika Grit? Also, of all the Maastrichtian Mosasaurs known so far, which ones would have been the mostly likely to have (at least briefly) survived the Cretaceous-Paleocene Extinction Event of 66 Million Years ago (would it have been generalist feeders, ones that specialized in deep sea hunting, ones with cosmopolitan distributions, ones small by mosasaur standards but still around the same size of the few confirmed large reptiles that survived the event like the 8 meter (26 feet) in length Thoracosaurus, or ones with all these traits and advantages)?
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- cretaceous paleocene mass extinction event
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- mosasaurus
- meirs farm site
- halisaurus
- paleocene ammonites
- paleocene oceans
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Hi! I have a mosasaur teeth and I'm pretty sure it's Halisaurus, but I still need some identification. Thank you! (This picture is the teeth compared to quarter of Canada)
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Hi everyone! I found this tooth that for sell, can you give me an advice is that Halisaurus or just Proganothodon? As I’m looking to collect the various of Creataceous Morocco. Thank you!
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From the album: Morroco Fossils
Halisaurus arambourgi Mosasaurus from the Grand Daoui area near Khouribga in central Morocco.Late Cretaceous-
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Hi everyone, Here’s a NJ Mosasaur vertebra I found a while back in a Cretaceous stream. It’s a rather unusual looking one, as it’s got some bully processes on the ventral side, is overall flattened, and tapers slightly toward the convex end. It might be preserved well enough to be able to tell if it’s Halisaurus. It is ~1.5”. If any more views are necessary, I can provide them. @non-remanié @Trevor @Carl @frankh8147 Thanks!
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I haven't been in a position to buy many fossils lately, but I did splash out on this small Halisaurus skull, which I felt was quite unusual. I'm not entirely sure how much of it is present. It looks like most of the front 2/3rds of the skull are mostly present. The visible jaw fragments on the right are confusing, since the teeth are pointing the wrong way. So presumably that got turned around somehow. It's a bit mixed up - also, it 'sinks' in the middle, as if it's been impacted against something (or bitten, but that might be a bit fanciful). There are probably some bones below the visible ones (perhaps a bit of the other jaw) but I'm not holding out hope for much. I like it, though. View from the snout. The visible jaw fragments on the left jaw (the mosasaur's left). With sausage fingers for scale.
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Hi guys, I have recently acquired this Mosasauroid partial jaw. Seller claimed it is a juvenile Mosasaur. He acknowledged that some of the teeth may have been reattached. But he didnt know which, he got it from his supplier like this. And upon further questioning, he also admited that he is not absolutely sure about the genus. He speculated juvenile Mosasaur due to its size, but i dont think a smaller genus of Mosasaur, like Halisaurus, Tethysaurus or Platecarpus, is out of the picture. Please help me identify the genus of this Mosasuroid and the location of this jaw (dentary or mandible, left or right). If you would be so kind, please also point out to me, which teeth are wrongly attached, or maybe, composite. (The 3 red arrows are the teeth that felt quite real) Thanks. Edit: Almost forgot, seller claimed it came from a Phosphate deposit at Khourigba, Morocco.
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I've been lucky enough to get hold of halisaur skull fragments over the past few years! I'd like to start assembling them in to some sort of composite for display purposes within my collection! I would love to see any Halisaurus skulls you guys have? Especially bone layouts so I may identify where my bones fit! Thanks!
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From the album: Mosasaurs
H. cf. arambourgi, 70.6 - 66 mya | late Cretaceous, Ouled Abdoun, Morocco, 9.16 inches long Note: I've got conflicting IDs for this jaw, with H. walkeri and H .sp being suggested. Do let me know if you've any input on this jaw -
From the album: Dinosaurs and Reptiles
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From the album: Mosasaurs
H. cf. arambourgi, 70.6 - 66 mya | late Cretaceous, Ouled Abdoun, Morocco, 9.16 inches long Note: I've got conflicting IDs for this jaw, with H. walkeri and H .sp being suggested. Do let me know if you've any input on this jaw -
From the album: Reptiles & Marine Reptiles collection
Halisaurus rooted tooth Genus: Halisaurus arambourgi Geological Age: Cretaceous Locality: Khouribga, Morocco Size: 3.54" -
From the album: Reptiles & Marine Reptiles collection
Mosasaur jaw in matrix Specie: Halisaurus arambourgui Locality: Ouled Abdoun, Morocco Geological Age: Cretaceous-
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From the album: Reptiles & Marine Reptiles collection
Halisaurus jaw piece Geological Age: Cretaceous Locality: Khouribga, Morocco -
From the album: Reptiles & Marine Reptiles collection
Halisaurus tooth Geological Age: Cretaceous Locality: Khouribga, Morocco