History
Thin clay layer marks a mass extinction
HERE’S THE INTERESTING PART
Scattered across the globe is a remarkably thin boundary of sediment packed with rare iridium, cleanly separating the age of giant terrestrial reptiles from the age of mammals. It is the literal geologic fingerprint of an apocalyptic asteroid strike. Nature politely filed away the terrifying destruction of an entire biosphere into a single, highly compressed layer of dirt.
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