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Found 14 results

  1. Lone Hunter

    Hunt for the oldest DNA

    https://www.pbs.org/wgbh/nova/. If you missed this show tonight it's worth watching. Extracting and sequencing DNA from dirt in Greenland that goes back 2.5 million years is the highlight and the results are incredible.
  2. 'Giant' predator worms more than half a billion years old discovered in North Greenland by University of Bristol, SciNews, January 2, 2023 The open access paper is: Tae-Yoon Park et al, A giant stem-group chaetognath, Science Advances (2024). DOI: 10.1126/sciadv.adi6678. Yorus, Paul H.
  3. As I have been researching large ctenacanthiform sharks from North America, I've been wondering if there are any known globally that are currently unnamed. I definitely know of the large Ctenacanthiformes Saivodus stratus (found in both what is now North America and Great Britain), the large Ctenacanthiform from the Permian Kaibab formation in Arizona, and the 'Texas supershark' (a likely large species of Gilkmanius) from the Pennsylvanian Texas Graham formation (all three as larger or larger than an adult Great White Shark (Carcharodon carcharias)). But are there any large ctenacanthiformes (at least in size comparable to a modern day adult Great white shark (Carcharodon carcharias)) currently unnamed that are also known? Ctenacanthiformes are known from North America, Greenland, Europe, Asia, and South America. https://www.mindat.org/taxon-P34476.html Even though study of Ctenacanthiformes as a whole is just starting to become more through within the past few decades, I'm wondering if anyone on the forum is aware of any currently unnamed Ctenacanthiform fossils from areas outside of North America of Great White Shark (Carcharodon carcharias)) size?
  4. https://www.bbc.com/news/science-environment-63867164
  5. Controversial impact crater under Greenland’s ice is surprisingly ancient New date of 58 million years undercuts idea that strike triggered recent 1000-year plunge in temperatures By Paul Voose, Science News, March, 9, 2022 Giant impact crater in Greenland occurred a few million years after dinosaurs went extinct by University of Copenhagen, PhysOrg Wikipedia article discussing Hiawatha impact structure The open access paper is: Kenny, G. G., and others, 2022, A Late Paleocene age for Greenland’s Hiawatha impact structure. Science Advances. vol. 8, no. 10 Yours, Paul H.
  6. Fossildude19

    Latest acquisition - fossil capelin

    From the album: Fossildude's Purchased/Gift Fossils

    Fossil fish nodule from the Lower Pleistocene Middle Holocene (Northgrippian Stage) of South West Greenland. Mallotus villosus. Thanks to @piranha for the age correction!

    © 2018 T. Jones

  7. Some of the world’s oldest rubies linked to early life Carbon residue that was once ancient life found encased in a 2.5 billion-year-old ruby, University of Waterloo Ancient Traces of Life Discovered Encased in a 2.5 Billion-Year-Old Ruby SciTechDaily, October 24, 2021 2.5 billion-year-old traces of life locked inside primeval ruby "The graphite inside this ruby is really unique." By Yasemin Saplakoglu , October 24, 2021 The paper is: Yakymchuk, C., van Hinsberg, V., Kirkland, C.L., Szilas, K., Kinney, C., Kendrick, J. and Hollis, J.A., 2021. Corundum (ruby) growth during the final assembly of the Archean North Atlantic Craton, southern West Greenland. Ore Geology Reviews, no. 104417. Yours, Paul H.
  8. Garde, A.A., Søndergaard, A.S., Guvad, C., Dahl-Møller, J., Nehrke, G., Sanei, H., Weikusat, C., Funder, S., Kjær, K.H. and Larsen, N.K., 2020. Pleistocene organic matter modified by the Hiawatha impact, northwest Greenland. Geology, 48(9), pp.867-871. open access paper Supplemental Material: Pleistocene organic matter modified by the Hiawatha impact, northwest Greenland Yours, Paul H.
  9. Top-secret Cold War military project found perfectly preserved fossil plants under Greenland ice By Mindy Weisberger, Live Science, March 2021 Andrew J. Christ, Paul R. Bierman, Joerg M. Schaefer, Dorthe Dahl-Jensen, Jørgen P. Steffensen, Lee B. Corbett, Dorothy M. Peteet, Elizabeth K. Thomas, Eric J. Steig, Tammy M. Rittenour, Jean-Louis Tison, Pierre-Henri Blard, Nicolas Perdrial, David P. Dethier, Andrea Lini, Alan J. Hidy, Marc W. Caffee, John Southon, 2021. A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century. Proceedings of the National Academy of Sciences Mar 2021, 118 (13) e2021442118; DOI: 10.1073/pnas.2021442118 Yours, Paul H.
  10. This 215 m.y. old dentary was only 2 cm long, but it tells a big story in early mammalian evolution. https://phys.org/news/2020-10-tiny-jaw-greenland-complex-teeth.html
  11. Green, C. E., 2019. Investigating the origin of a Greenland ice core geochemical anomaly near the Bølling-Allerød/Younger Dryas boundary (Doctoral dissertation, Durham University). http://etheses.dur.ac.uk/13490/ http://etheses.dur.ac.uk/13490/1/C_Green_thesis_final_CORRECTIONS.pdf Green (2019) noted: "The source of a platinum peak identified in the Greenland Ice Sheet Project 2 (GISP2) ice core associated with high platinum/iridium (Pt/Ir) and platinum/aluminium (Pt/Al) ratios, and previous research attributed the anomaly to an unusual iron-rich Ir-poor meteorite impact." Green (2019) concluded: I. the Laacher See eruption is not the Pt spike source because: A. the Laacher See tephra has low Pt concentrations, B. the Laacher See tephra’s geochemical ratios are dissimilar to the GISP2 Pt spike and C. conversion of the Pt spike timing to the newest ice core age-depth model shows a chronological offset of ~60 years between the two events. II. The event resulting in the Pt spike occurred ~60 years after GS-1 cooling, and was therefore not the primary trigger. III. and the Pt spike origin is interpreted as either: A. a noncataclysmic impact of an undiscovered iron meteorite B. or an unidentified Pt-rich volcanic eruption contemporaneous with the anomaly, whose aerosol fractionated in the atmosphere or ice. Yours, Paul H.
  12. DevonianDigger

    Greenland Fish Nodules

    Just got in some nodules from Greenland courtesy of our good friend @holdinghistory. Never dealt with these before. Do I freeze/thaw these? What would be the best course of action for opening these little fishies up?
  13. Asteroids, Micro Diamonds, and the Younger Dryas with Jens Notroff: Archaeological Fantasies Ep 106 Archaeological Fantasies Podcast https://player.fm/series/archaeological-fantasies-podcast/asteroids-micro-diamonds-and-the-younger-dryas-with-jens-notroff-archaeological-fantasies-ep-106 https://player.fm/series/archaeological-fantasies-podcast The Deus ex machina for the destruction of civilizations, either imaginary or real, seems to be comet impacts. Remix – Atlantis in Sardinia with Dr. Emily Holt Archaeological Fantasies ep 107 https://player.fm/series/archaeological-fantasies-podcast/remix-atlantis-in-sardinia-with-dr-emily-holt-archaeological-fantasies-ep-107 https://player.fm/series/archaeological-fantasies-podcast Yours, Paul H.
  14. Scientist May Have Discovered Massive Crater Under Greenland Ice Sheet, Daily Beast, Feb. 2019 https://www.thedailybeast.com/scientist-may-have-discovered-massive-crater-under-greenland-ice-sheet Photos: Craters Hidden Beneath the Greenland Ice Sheet, Live Science, February 12, 2019 https://www.livescience.com/64755-photos-greenland-craters.html The open access paper is: Joseph A. MacGregor, William F. Bottke, Jr., Mark A. Fahnestock, Jeremy P. Harbeck, Kurt H. Kjær, John D. Paden, David E. Stillman, and Michael Studinger, 2019, A Possible Second Large Subglacial Impact Crater in Northwest Greenland First published: 11 February 2019 https://doi.org/10.1029/2018GL078126 https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2018GL078126 The paper states: "Based on the dated radiostratigraphy of the Greenland Ice Sheet, available for pre-2014 radar data only, the ice overlying the structure is at least 79 ka old (Figures 1e–1h; MacGregor et al., 2015)." Yours, Paul H.
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