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Field Kit Sokkia Notebook Holster/Backpack Handlens Hammer Belt Pocket Transit Gilson Grain Size Card Acid Bottle Pocket Knife Pencils/Lead Protractor Ruler Combo Streak Plate Mohs Picks Fun Paper Friday What can we learn about the Earth's magnetic field from tree rings? Cooper, Alan, et al. "A global environmental crisis 42,000 years ago." Science 371.6531 (2021): 811-818. (https://science.sciencemag.org/content/371/6531/811) Science Mag Article (https://www.sciencemag.org/news/2021/02/ancient-kauri-trees-capture-last-collapse-earth-s-magnetic-field) Contact us: Show Support us on Patreon! (https://www.patreon.com/dontpanicgeo) www.dontpanicgeocast.com (http://www.dontpanicgeocast.com) SWUNG Slack (https://softwareunderground.org) @dontpanicgeo (https://twitter.com/dontpanicgeo) show@dontpanicgeocast.com John Leeman - www.johnrleeman.com (http://www.johnrleeman.com) - @geo_leeman (https://twitter.com/geo_leeman) Shannon Dulin - @ShannonDulin (https://twitter.com/ShannonDulin)