Re: Belgian Hn disappeared c 42 ka, not 24 ka

Ruth Davies

Magnetic Polar Reversal EG Laschamp ~ 42kya entails massive bombardment of solar radiation normally shielded by geomagnetic field. [actually cosmic ray flux by night as well as day]. The timing has now been given new precision with cores from a Tasmanian lake bed. The implications for multicellular life [apart from Tardigrades!] make nocturnal pursuits and diurnal concealment obligatory. I can post references but they're all accessible via google etc.

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