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Found 12 results

  1. bockryan

    Otodus megalodon

    From the album: Fossil Collection: DC Area and Beyond

    Otodus megalodon Aurora Fossil Museum, NC Pungo River and Yorktown Formations Miocene
  2. bockryan

    Otodus megalodon

    From the album: Fossil Collection: DC Area and Beyond

    Otodus megalodon Peace River (Wauchula), FL Peace River Formation Miocene
  3. From the album: Florida Fossil Finds: Peace River, Venice, and Key West

    A better find than my slightly broken Meg, this one is also from Harry Pristis. But in my collection!
  4. This is something I just found out yesterday, but feel is amazing enough to share on the fourm (especially to all those who study Carcharocles (Otodus) megalodon)!!! I was researching shark diversity during the late Eocene when I came across some info on a fossil Shark rostral node specimens from the Zanclean Pilocene sections of the Yorktown Formation dating around 5.3-3.6 Million Years ago in what is now North Carolina. The Specimens USNM 474994, 474995, 474996, 474997, 474998, and 474999 belongs to juvenile sharks (with USNM 474998 belonging to an individual shark of about 1.46 meters (4.8 feet) in length). Originally believed to be rostral nodes of a Lamna sp., they were reanalyzed and discovered by Scientists Dr. Frederik H. Mullen and Dr. John W.M. Jagt to be from Juvenile Otodontidae Sharks. (also, USNM = National Museum of Natural History, Washington D.C., U.S.A.) Mollen, F.H. and Jagt, J.W.M. (2012). The taxonomic value of rostral nodes of extinct sharks, with comments on previous records of the genus Lamna (Lamniformes, Lamnidae) from the Pliocene of Lee Creek Mine, North Carolina (USA). Acta Geologica Polonica, 62(1), 117–127. https://www.researchgate.net/publication/262142193_The_taxonomic_value_of_rostral_nodes_of_extinct_sharks_with_comments_on_previous_records_of_the_genus_Lamna_Lamniformes_Lamnidae_from_the_Pliocene_of_Lee_Creek_Mine_North_Carolina_USA Reconstruction by Tyler Greenfield, 2021 This research also strongly indicates/directly suggests these rostral node specimens might belong to fetal or newborn individuals of Carcharocles (Otodus) megalodon!!! If correct, it would be the one of the most significant finds in terms of non-tooth C. megalodon fossil material since the relatively recent discovery of specimen IRSNB P9893 (also known as IRSNB 3121), a pretty complete C. megalodon fossil vertebrae column from a Miocene Formation in what is now Belgium!!! Shimada, Kenshu & Bonnan, Matthew & Becker, Martin & Griffiths, Michael. (2021). Ontogenetic growth pattern of the extinct megatooth shark Otodus megalodon —implications for its reproductive biology, development, and life expectancy. Historical Biology. 33(12), 1-6. 10.1080/08912963.2020.1861608. https://par.nsf.gov/servlets/purl/10293771
  5. Tidgy's Dad

    Megalodon BBC Article

    https://www.bbc.com/future/article/20230801-megalodon-the-superpredator-that-ate-its-siblings-in-the-womb
  6. I've recently read a 2020 scientific paper describing pretty accurately the multiple nurseries that Carcharocles (Otodus) megalodon had established to raise young between the Miocene-Pliocene 23-3.6 Million Years ago (not just a single nursery in what is now Panama as previously thought). Herraiz, J. L., Ribé, J., Botella, H., Martínez-Pérez, C., & Ferrón, H. G. (2020). Use of nursery areas by the extinct megatooth shark Otodus megalodon (Chondrichthyes: Lamniformes). Biology Letters, 16(11), 20200746. https://doi.org/10.1098/rsbl.2020.0746 https://royalsocietypublishing.org/doi/10.1098/rsbl.2020.0746 What I also found interesting about this paper was that the geologic latest nursery area the researchers identified is what is now the Yorktown Formation, North Carolina. Images Credit: https://royalsocietypublishing.org/doi/10.1098/rsbl.2020.0746 C. megalodon went extinct in the Mediterranean as a result of the Messinian Salinity crisis 5.59 Million Years ago. The emergence of Orcas (Orcinus) and the Great White Shark (Carcharodon carcharias), a decrease in diatom diversity during the middle miocene-pliocene, and the miocene formation of the Isthmus of Panama which changed ocean current patterns also helped caused a decline in C. megalodon's population by the Pliocene. But this 2020 paper has got me thinking about where did C. megalodon as a species make its last stand? Was the Yorktown Formation in North Carolina C. megalodon's last stronghold?
  7. The era between the Miocene and Pliocene (23-2.3 Million Years ago) was, like the Carboniferous era 300 Million Years before, a golden age for the Chondricthyans. Not only was there a massive explosion in the diversity of grey sharks, but there was the emergence of perhaps the largest number of large macropredatory shark genera (sharks greater than 3 meters (10 feet) in length) currently known in Earth's geologic history. This includes the Giant Thrasher Shark Alopias grandis (which grew up to 13 meters (feet) in length) and the famous Carcharocles (Otodus) megalodon (which grew up to 17 meters (55 feet) in length). https://www.science.org/doi/10.1126/sciadv.abm9424 But this golden era of the giant macro predatory sharks wouldn't last, for between 3.8-2.4 Million Years ago there was an extinction event of large marine fauna that killed at least 14% of large marine fauna genera, including Carcharcoles (Otodus) megalodon. Though it's not entirely clear what caused this extinction event (some have hypothesized it could've been a mild gamma ray burst), C.megalodon's decline was due to the closing of the Isthmus of Panama by 4.5 Million Years ago (an area that was a C.megalodon nursery), a decline in diatoms that caused a decline in the food sources of many whales like Cetothere whales including Cetotherium (a known food source of C. megalodon), and Competition with the recently emerged Great White Shark (Carcharodon carcharias) and Orcas (Orcinus). By the extinction events end, most of the Miocene's large predatory sharks were extinct. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6377595/ https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0084857 https://www.researchgate.net/publication/318160879_The_Pliocene_marine_megafauna_extinction_and_its_impact_on_functional_diversity https://royalsocietypublishing.org/doi/10.1098/rsbl.2020.0746 But there was a few genera that survived the extinction event 3.6-2.4 Million Years ago and lived long after it. These surviving taxon (likely surviving due to relying on different food sources then other large sharks of the miocene-pliocene) lived previously alongside C. megalodon and some survived up to at least the early Pleistocene (120,000-100,000 years ago). Here's a list of the large (non Great White Shark (Carcharodon carcharias)) macropredatory sharks of the late Pliocene-Early Pleistocene (If I'm missing any examples, let me know and I'll quickly add them). Hemipristis serra (Hemigaleidae, grew up to 3-5 meters (10-16 feet) in length) (Miocene-Pleistocene (Pleistocene strongholds: What is now Indonesia, Taiwan, South Carolina (U.S.), Alabama (U.S.), and Florida (U.S.)), 23.03-0.012 Million Years ago) Reconstruction 1 and 2 Image by artist @Tetrtophoneus, Image credit: https://www.deviantart.com/teratophoneus/art/Hemipristis-serra-871902574 Image by artist @HodariNundu (the two sharks below and next to the juvenile C.megalodon at the middle top are adult Hemipristis serra), Image credit: https://www.deviantart.com/hodarinundu/art/Mobbing-Meg-885731702 http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=83182 https://www.fossilguy.com/gallery/vert/fish-shark/hemipristis/hemipristis.htm https://www.researchgate.net/publication/364591134_A_previously_overlooked_highly_diverse_early_Pleistocene_elasmobranch_assemblage_from_southern_Taiwan Parotodus benedeni (Otodontidae, grew up to 7.6 meters (24.9 feet) in length) (Oligocene-Pleistocene (Pleistocene strongholds: What is now South Carolina (U.S.)), 33.9-0.012 Million Years ago) Reconstructions 1 and 2 Image by artist @imAdro, Image credit: https://www.deviantart.com/imadro/art/Parotodus-benedeni-908901669 Image by artist @SameerPrehistorica, Image credit: https://www.deviantart.com/sameerprehistorica/art/Parotodus-Size-882947974 http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=389883 https://www.petit-fichier.fr/2013/01/27/kent-b-w-1999-taille-parotodus-benedenii/? https://www.researchgate.net/publication/337937278_2019-canevet-a-review-of_the-extinct-genus-Parotodus https://www.app.pan.pl/archive/published/app63/app004542018.pdf http://www.fossilworks.org/cgi-bin/bridge.pl?a=collectionSearch&taxon_no=389883&max_interval=Quaternary&country=United States&state=South Carolina&is_real_user=1&basic=yes&type=view&match_subgenera=1 https://www.cambridge.org/core/journals/paleobiology/article/chondrichthyan-fossil-record-of-the-florida-platform-eocenepleistocene/2835CCEC27DC8EE0B24A5B62B1416618 Cosmopolitodus hastalis (Lamnidae, grew up to 5-7 meters (16.4-22.9 feet) in length) (Oligocene-Pleistocene (Pleistocene strongholds: What is now Japan, South Carolina (U.S.), Alabama (U.S.), and Florida (U.S.)), 30-0.012 Million Years ago) Reconstruction Image by artist @artbyjrc, Image credit: https://www.deviantart.com/artbyjrc/art/Going-to-need-a-bigger-boat-Lamnid-sharks-837971394 http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=265174 https://actapalrom.geo-paleontologica.org/Online_first/Chan_Cosmopolidus_planus.pdf Note: Cosmopolitodus hastalis was an ancestor to the extant Great White Shark (Carcharodon carcharias), along with living alongside the Great White Shark (Carcharodon carcharias) between the Miocene-Pleistocene. However, Cosmopolitodus hastalis’s being a member of the genus Carcharodon has yet to be confirmed). I hope you all find this helpful?
  8. Recently I found a really interesting article rom 2021 describing fossilized specimens (in the form of teeth) of the giant shark Carcharocles (Otodus) megalodon from Buenos Aires Province, Argentina. Here is the article: De Pasqua, J., Agnolin, F., Rolando, A. M., Bogan, S., & Gambetta, D. (2021). First occurrence of the giant shark Carcharocles Megalodon (Agassiz, 1843) (Lamniformes; Otodontidae) at Buenos Aires Province, Argentina. Revista Brasileira De Paleontologia, 24(2), 141–148. https://doi.org/10.4072/rbp.2021.2.05 https://www.researchgate.net/publication/354201776_First_occurrence_of_the_giant_shark_Carcharocles_megalodon_Agassiz_1843_Lamniformes_Otodontidae_at_Buenos_Aires_Province_Argentina What really actually baffled me was the age the scientists who authored the paper assigned to the specimens. The specimen MMDA-1 was found close to the Atlantic coast in sedimentary deposits consisting of five depositional sequences (DS) dating between the Miocene and early Pleistocene eras. The authors state its possible the specimen came from DS5 or DS4, which date between the late Pilocene-early Pleistocene eras. If this is correct, this would make this incredible find even more incredible as it would represent the youngest known Carcharocles (Otodus) megaldon fossils (and no, I'm definitely not counting the HMS Challenger specimens as it's pretty much been confirmed those specimens are much much older than several thousand years old). Also, this is not potential proof C. megalodon survived into the Holocene! Though, I'm am a bit skeptical about the age give it was found in a pretty loose sedimentary deposit by the coast! What do you guys think? Do you think specimen MMDA-1 could be from the late Pilocene-early Pleistocene or do you think it could be older?
  9. Some hints on the extinction of our cherished Meg: Trophic position of Otodus megalodon and great white sharks through time revealed by zinc isotopes (link to nature communications) Great white sharks may have contributed to megalodon extinction (link to science daily) Franz Bernhard
  10. ThePhysicist

    Hubbell Megalodon

    From the album: Sharks

    Hubbell (juvenile) megalodon, likely from the East Coast. I don't understand the hype surrounding megalodon, but this one was cool enough for the collection. It has good preservation, and the tip is spalled-off from feeding.
  11. BellamyBlake

    Exotic Megalodons!

    I've been acquiring Megalodon teeth from different localities over the past weeks. It's an ongoing project. I'm thrilled to share the first bit of my collection! I thank various members for sharing their knowledge of these localities with me. I would like to thank in particular @Praefectus for bouncing ideas, and for offering his thoughts on the legitimacy of almost every one of these; I also thank @gigantoraptor for generously gifting me the Dutch Meg!
  12. True size of prehistoric mega-shark finally revealed University of Bristol, September 3, 2020 A new study has revealed the size of the legendary giant shark Megalodon, including fins that are as large as an adult human. The open access paper is: Jack A. Cooper, Catalina Pimiento, Humberto G. Ferrón, Michael J. Benton. Body dimensions of the extinct giant shark Otodus megalodon: a 2D reconstruction. Scientific Reports, 2020; 10 (1) DOI: 10.1038/s41598-020-71387-y Yours, Paul H.
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