An ancient tree that contains a record of an almost reversal of Earth’s magnetic field has been discovered in New Zealand. The tree—an Agathis australis, better known as its Maori name kauri—was found in Ngawha, on New Zealand’s North Island, during excavation work for the expansion of a geothermal power plant, stuff.nz reports. (Watch the video too, it is fascinating!
https://www.newsweek.com/ancient-tree-discovered-earths-magnetic-field-1447570