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Showing results for tags 'paleocene'.
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From the album: Aquia Formation
These teeth are generally identified as Cretalamna appendiculata but should probably be Cretalamna sp.© bthemoose
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From the album: Aquia Formation
These teeth are generally identified as Cretalamna appendiculata but should probably be Cretalamna sp.© bthemoose
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From the album: Aquia Formation
These teeth are generally identified as Cretalamna appendiculata but should probably be Cretalamna sp.© bthemoose
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From the album: Aquia Formation
© bthemoose
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From the album: Aquia Formation
© bthemoose
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From the album: Aquia Formation
© bthemoose
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From the album: Aquia Formation
© bthemoose
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From the album: Aquia Formation
© bthemoose
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From the album: Aquia Formation
A big chunky tooth that measures 48.6 mm on the slant and is the largest Otodus I've found© bthemoose
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From the album: Aquia Formation
Extreme posterior tooth and the smallest Otodus I've found© bthemoose
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From the album: Aquia Formation
© bthemoose
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From the album: Aquia Formation
Some serration and tip damage but this is a really nice and huge Palaeocarcharodon (measures 34.2 mm on the slant) for the formation© bthemoose
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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)? -
Questions about Paleocene records of the Bird Asteriornis
Joseph Fossil posted a topic in General Fossil Discussion
I'm researching bird fauna from the Danian Paleocene era recently and I have some questions about a particular bird, Asteriornis maastrichtensis. It was discovered in late 2019 in Maastrictian deposits of the Maastricht Formation, Cretaceous dating 66.8-66.7 Million Years ago in what is now Belgium and was pretty small in size, about the size of a small duck and weighed only 394 grams when alive. https://www.nature.com/articles/s41586-020-2096-0 Asteriornis is the earliest confirmed Neognathae (a group of birds of which the majority of birds alive today belong to) and it's oldest remains date to just around One Million Years before the Cretaceous-Paleocene Astroid impact wiped out that last of the non-avian dinosaurs. I've seen a lot of people say that this bird species survived the Cretaceous-Paleocene Extinction event into the Paleocene. It's small size and diet of seeds make it a good candidate to have survived the event, but I haven't found any definitive records yet of Asteriornis from the early Paleocene. What I'm wondering is did Asteriornis survive the Cretaceous-Paleocene Mass Extinction Event 66 Million Years ago and are there any records of Asteriornis that date definitively to the Paleocene era? -
Hello, I found what appears to be well preserved casts of clams and sea snails and also a possible bone or coral fragment but I’m not sure what most of them are except for the sea snails which I think is Turritella sp. But I’m not sure exactly. I’m not sure exactly what formation it is either but I do know it’s most likely the Ripley formation, Providence sand formation, Clayton formation, or Nanafalia formations. So I was wondering if someone could help me identify what species these belonged to and maybe even what period there from, thanks in advance.
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Paleocene Regular Echinoid from the Vincentown Formation, N.J. IMG_9382
Jeffrey P posted a gallery image in Member Collections
From the album: Tertiary
Selenia tumidula Salenioid Echinoid (Regular) 1/2 inch across Paleocene Vincentown Formation Rancocas Creek Vincentown, N.J.-
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Paleocene Starfish Ossicles from the Vincentown Formation, N.J.
Jeffrey P posted a gallery image in Member Collections
From the album: Tertiary
Goniaster mammilata Starfish Ossicles 1/4 inch Paleocene Vincentown Formation Rancocas Creek Vincentown, N.J. A gift from HistorianMichael- 1 comment
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I went to douglas point a few days ago, eager to get a large Otodus. What I did not expect to find was a skull fragment with teeth still embedded inside! None of the teeth are complete, but there is a lot of them, and it’s a pretty nice sized chunk of crocodile skull. I wasn’t even planning on doing douglas point that day, but we looked at both of the parking lots of both places, purse state, and douglas point, and I decided that zero cars was better than trying to navigate the beach with over 12 or so cars parked. There was no room for us to pull in anyways so I chose douglas point instead. The hunt started off very typically. I found a few goblins and sand tigers, some really nice bone fragments, and some busted up Otodus, one of which would have hit 1.75 if complete :(. But about half way through the trip, I found something odd. I thought it was one of the sandstone rocks from the zone 3 but it was colored brownish, so I picked it up and when I flipped it, there were rows and rows of teeth lining the bottom. I thought at first that I just found a jaw in the rock and did a little victory dance. It wasn’t until I investigated further that I came to realize that this was a piece of SKULL. WHAT?!?!? In my 10 years of collecting, I never would have thought that I’d ever find a skull. I was ecstatic! I will be taking this to the Calvert marine museum for further study and if they need this, I will give it up :(. That’s what a good scientist would do. Anyways, here are all the finds from that day. I found a lot. The whole haul: The whole haul flipped: Close up of the better stuff: I found 3 broken up Otodus teeth, a complete shark vertebrae, a scute, a coprolite with a fish scale inside, and a crocodile skull fragment. All the better stuff flipped: Underside of the skull: There are so many teeth in here! This is my first every crocodile skull, I’m now hoping to find the other pieces when I come back to this location. What a find! Coprolite: You can actually see what this animal had for lunch. This is a pretty neat fossil and would probably have been my favorite if not for the skull! Thank you for reading guys. I hope you enjoyed this trip report!
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Hello! Drove down from Jersey and a good day at Douglas Point this past Sunday. Over 150 teeth in all, two nice- yet worn- Otodus teeth and a Paleocarcharodon orientalis. I also found this, and I don't know what it is. Maybe it's nothing. Photos are taken on a cutting board with a 1" grid.
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