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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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Hi all, I ventured to NJ to visit Big Brook and Ramanessin Brook last weekend (Cretaceous, monmouth group). I found quite a lot of shark teeth I still have to sort through, but I could use help ID'ing some other fossil finds. Some comments on each 1. This looks a little like bone to me of some kind, but not sure. 2-5 look like plates or scutes. Not sure if turtle or croc. I realize 4 may be just a cool concretion, but I wanted to check. 6. This one is fascinating with a suture pattern of sorts that looks like it joins two pieces with the same finger like pattern as those prominences. 7. Looks like a small piece of something in matrix. 8. I think this might be a sawfish tooth but it would be my first one and I wanted to double check. 9. I think this is a large Enchodus tooth? It has only a single edge to it. 10. I think this is clearly a small ungulate tooth of some kind. Not clear if it's a fossil or an extant species. 11. Another something in matrix. You can see a bumpy/rough surface to the fossil in the second two photos. 12, 13. The tooth on the right I think is Enchodus, but I'm not sure about the one on the left. Thanks all!
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- big brook
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Hi all, it's me again! for my first expedition of the year, I decided to go to big brook to try my hand collecting there. had quite the adventure, found some neat things. but there are a handful of oddity's that I am unsure. in my research that ive done over the day I have a couple ideas, but any confirmation from experts is always appreciated. first one up is this weird thing. I'm not sure what this is although it's no concretion these ones are also strange, but I have some ideas on a few of them. top two are probably vertebrae fragments, but I have no clue what they are from. bottom left is a total mystery, but I think that the shark tooth in the right is possibly a Hybodont tooth. I say this because of all the research I've done both on this forum and the Big brook website. it is the only one that matches the profile. more views below @The Jersey Devil @Rockwood any ideas?
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From the album: A.C.'s Cretaceous New Jersey
Choristothyris plicata (Say) Big Brook- 1 comment
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- big brook
- brachiopod
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From the album: A.C.'s Cretaceous New Jersey
Cretolamna appendiculata lata (Agassiz) Big Brook NJ-
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From the album: A.C.'s Cretaceous New Jersey
Ischyodus cf. bifurcatus (Case) Ramanessin Brook-
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From the album: A.C.'s Cretaceous New Jersey
Enchodus petrosus (Cope) Ramanessin Brook-
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From the album: A.C.'s Cretaceous New Jersey
Lunatia halli (Gabb) Big Brook (Bottom), Ramanessin Brook (Top)-
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From the album: A.C.'s Cretaceous New Jersey
Protocallinassa mortoni (Pilsbry) Big Brook -
From the album: A.C.'s Cretaceous New Jersey
Cucullaea sp.? Big Brook -
From the album: A.C.'s Cretaceous New Jersey
Belemnitella americana (Morton) Big Brook -
From the album: A.C.'s Cretaceous New Jersey
Brachyrhizodus wichitaensis (Roemer) Left Ramanessin Brook, Right Big Brook-
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From the album: A.C.'s Cretaceous New Jersey
Ramanessin Brook-
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From the album: A.C.'s Cretaceous New Jersey
Sister found this one. I believe it to be a developing sawfish rostral tooth. Ischyrhiza mira (Leidy) Ramanessin Brook-
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From the album: A.C.'s Cretaceous New Jersey
Enchodus petrosus (Cope) Ramanessin Brook-
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- enchodus
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From the album: A.C.'s Cretaceous New Jersey
Ischyrhiza mira (Leidy) Ramanessin Brook-
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From the album: A.C.'s Cretaceous New Jersey
Squatina hassei (Leriche) Ramanessin Brook-
- angelshark
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From the album: A.C.'s Cretaceous New Jersey
Thoracosaurus neocesariensis (Dekay) Ramanessin Brook-
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- crocodile
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From the album: A.C.'s Cretaceous New Jersey
Scapanorhynchus texanus (Romer) Ramanessin Brook-
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- goblin shark
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From the album: A.C.'s Cretaceous New Jersey
Anomaeodus phasolus (Hay) Ramanessin Brook-
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- pycnodont
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From the album: A.C.'s Cretaceous New Jersey
Scapanorhynchus texanus (Romer) Ramanessin Brook-
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- goblin shark
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From the album: A.C.'s Cretaceous New Jersey
Hybodus sp. Ramanessin Brook-
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- hybodus
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From the album: A.C.'s Cretaceous New Jersey
Proghathodon rapax (Hay)? Ramanessin Brook-
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- mosasaur
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Been awhile since I posted,and been many weeks since the wife and I have fossil hunted in the Monmouth county streams due to being so busy at work,but Friday was able to get outta work real early and head up to the streams,just love getting out there and enjoying nature….nothing outta of the usual but a wonderful time with the wifey
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Hi everyone, I found this at Ramanessin Brook today. I thought it resembled the crocodile scutes that can be found here but I've never seen one in person and I know that concretions can do really tricky things so I'm not sure. Thoughts?
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- cretaceous nj
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