Exploring abrupt climate change induced by comets and asteroids during human history

January 27, 2014

Restored from the library fire 1/9/20
 The excavation at Bull Creek, Oklahoma, shows the paleosol — ancient buried soil; the dark black layer in the side of the cliff — that formed during the Younger Dryas. – UCSB   More recently, another group of earth scientists, including UCSB’s Alexander Simms and alumna Hanna Alexander, re-examined the distribution of nanodiamonds in…
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