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Showing results for tags 'isua supracrustal belt'.
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Geologists discover rocks with the oldest evidence yet of Earth’s magnetic field.
Oxytropidoceras posted a topic in Geology
Geologists discover rocks with the oldest evidence yet of Earth’s magnetic field. The 3.7 billion-year-old rocks may extend the magnetic field’s age by 200 million years. Jennifer Chu | MIT News, April 24, 2024 Ancient Rocks Reveal Earth's Magnetic Field Existed 3.7 Billion Years Ago, Science Alert, April 27, 2024 The open access paper is: Nichols, C.I., Weiss, B.P., Eyster, A., Martin, C.R., Maloof, A.C., Kelly, N.M., Zawaski, M.J., Mojzsis, S.J., Watson, E.B. and Cherniak, D.J., 2024. Possible Eoarchean records of the geomagnetic field preserved in the Isua Supracrustal Belt, southern west Greenland. Journal of Geophysical Research: Solid Earth, 129(4), p.e2023JB027706. Yours, Paul H.-
- Eoarchean
- geomagnetic field
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"World's Oldest Fossils" (Stromatolites, Greenland) Might Actually Be Simple Rocks
Oxytropidoceras posted a topic in Fossil News
Geologists Question 'Evidence Of Ancient Life' In 3.7 Billion-Year-Old Rocks, NPR, All Things Considered https://www.npr.org/2018/10/17/658103489/geologists-question-evidence-of-ancient-life-in-3-7-billion-year-old-rocks "World's Oldest Fossils" Might Actually Be Simple Rocks, And We're Here For The Drama, Carly Cassella, Science Alert https://www.sciencealert.com/doubt-raised-over-current-record-holder-oldest-fossil-sign-of-life The paper is: Abigail C. Allwood, Minik T. Rosing, David T. Flannery, Joel A. Hurowitz and Christopher M. Heirwegh, 2018, Reassessing evidence of life in 3,700-million-year-old rocks of Greenland. Nature, Letter | Published: 17 October 2018 https://www.nature.com/articles/s41586-018-0610-4 A related paper is; Retallack, G.J. and Noffke, N., 2018. Are there ancient soils in the 3.7 Ga Isua Greenstone Belt, Greenland?. Palaeogeography, Palaeoclimatology, Palaeoecology. Volume 514, Pages 18-30. https://www.sciencedirect.com/science/article/pii/S0031018218305984 Yours, Paul H.