[Paladin2]

The spike is apparently a 1.2% increase found in the "... analysis of the rings of two Japanese cedar trees "

I think more samples from a wider spatially distributed tree sampling is in order before thinking that the sky is falling and we're all going to die (maybe).

[njslim]

That is only the increase in Carbon 14

Beryllium -10 is radioactive with half life of over
1 million years, it would be found by examining ice cores
and picking up the increase in Be-10 for that time