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Re: Mega eruption may have wiped out [Cambrian] life
Said to correspond to the Early-Middle Cambrian boundary... but...
Australian geologists used the chemical signatures of the far-flung
basalt lava rocks and their ages to connect them to a single huge
volcanic eruptive episode between 505 and 508 million years ago...
... http://www.stratigraphy.org/gssp.htm doesn't have a series boundary
between ~ 513 and ~ 501 Ma ago.