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Showing results for tags 'hornerstown formation'.
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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)? -
Has anyone gone fossil hunting in Camden County or the surrounding counties (Gloucester, ? (New Jersey)
Suchascenicworld posted a topic in General Fossil Discussion
Hey everyone, I just moved to South Jersey (from North Jersey) a few months back. I love fossil hunting, but I am afraid that I do not know much about the area other than some of the bigger sites or finds (i.e. Hadrosaurus in Haddonfield, the Rowan site). Today, I drove to check out the tributaries around Big Timber Creek in Stratford. While the stratigraphy looked quite nice at a few places, I unfortunately came out empty handed. I work in GIS so I have been following the bedrock with stream layers, but I suspected that I probably should add topology in there! I am hoping to follow the Navesink and Mt. Laurel formations up from there. Anyways, this is all new to me! if anyone had any tips or advice for fossil hunting down here, than let me know! Any advice is greatly appreciated! thank you -
From the album: Just Above the Iridium Layer
Granocardium sp.? Cast of bivalve shell Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, N.J. -
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Cast of Tiny Bivalve Shell from the Pinna Layer
Jeffrey P posted a gallery image in Member Collections
From the album: Just Above the Iridium Layer
Crenella cerica Cast of Tiny Bivalve Shell Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, N.J. -
Cast of Tiny Partial Scallop Shell from the Pinna Layer
Jeffrey P posted a gallery image in Member Collections
From the album: Just Above the Iridium Layer
Pecten whitfieldi Cast of tiny partial scallop shell Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, N.J. -
Cast of Partial Gastropod from the Pinna Layer
Jeffrey P posted a gallery image in Member Collections
From the album: Just Above the Iridium Layer
Deussseni sp.? Cast of partial gastropod Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, N.J. -
From the album: Just Above the Iridium Layer
Trigonia eufaulensis Cast of Bivalve Shell Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, N.J. -
From the album: Just Above the Iridium Layer
Gyrodes supraplicatus Cast of Gastropod Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, N.J. -
From the album: Just Above the Iridium Layer
Pycnodonte convexa Cast of Oyster Shell Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, N.J. -
From the album: Just Above the Iridium Layer
Cucullaea vulgaris Pair of Bivalve Casts Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, N.J. -
Paleocene Bivalve from the Hornerstown Formation
Jeffrey P posted a gallery image in Member Collections
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From the album: Tertiary
Ostrea tecticosta (bivalve) Paleocene Hornerstown Formation Crosswicks Creek New Egypt, N.J.-
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Serpulid Worm Burrows from Crosswicks Creek, N.J.
Jeffrey P posted a gallery image in Member Collections
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From the album: Tertiary
Serpulid Worm Burrows Paleocene Hornerstown Formation Crosswicks Creek New Egypt, N.J. A gift from frankh1847. Collected 3/19/18- 2 comments
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Paleocene Brachiopods from Crosswicks Creek, N.J.
Jeffrey P posted a gallery image in Member Collections
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From the album: Tertiary
Oleneothyris harlani (brachiopods) Paleocene Hornerstown Formation Crosswicks Creek New Egypt, N.J. collected 3/19/18-
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Partial Baculites from the Pinna Layer with Suture Pattern
Jeffrey P posted a gallery image in Member Collections
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From the album: Just Above the Iridium Layer
Eubaculites sp. (partial baculite shell) Paleocene Hornerstown Formation Pinna Layer Manasquan River Basin Freehold, NJ. Collected and prepped by Ralph Johnson. Donated to this writer.- 1 comment
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Another Partial Baculite from the Pinna Layer
Jeffrey P posted a gallery image in Member Collections
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From the album: Just Above the Iridium Layer
Eubaculites (partial baculite shell) Paleocene Hornerstown Formation Pinna Layer Manasquan River Basin Freehold, New Jersey Collected and prepared by Ralph Johnson. Donated to this writer.-
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From the album: Just Above the Iridium Layer
Branchiocarcinus flectus (crab pincer) Paleocene Hornerstown Formation Pinna Layer Manasquan River Basin Freehold, New Jersey prepared by Ralph Johnson -
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From the album: Just Above the Iridium Layer
Discoscaphites iris (partial ammonite- includes the living chamber) Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, New Jersey prepared by Ralph Johnson -
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From the album: Just Above the Iridium Layer
Cucullaea vulgaris (bivalve shell- internal mold) Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, New Jersey -
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From the album: Just Above the Iridium Layer
Pseudomaxilis sp. (possible gastropod or worm) Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, New Jersey -
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From the album: Just Above the Iridium Layer
Deussenia sp. (partial gastropod) Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, New Jersey -
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From the album: Just Above the Iridium Layer
Pecten argillensis (bivalve shell) Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, New Jersey -
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From the album: Just Above the Iridium Layer
Crassatella sp. (bivalve) Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, New Jersey a gift from Ralph Johnson -
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From the album: Just Above the Iridium Layer
Discoscaphites iris (ammonite pieces) Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, New Jersey- 2 comments
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From the album: Just Above the Iridium Layer
Eubaculites sp. (straight shelled ammonite (baculite) pieces) Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, New Jersey -
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From the album: Just Above the Iridium Layer
Eubaculites sp. (partial straight shelled ammonite (baculite)) Paleocene Pinna Layer Hornerstown Formation Manasquan River Basin Freehold, New Jersey
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