A message from our CEO about the future of Stack Overflow and Stack Exchange. Read now.

# Tag Info

I can't be entirely sure but I'll make an informed guess: That value doesn't come for a single measurement. Therefore, if the error in the age of a single sample is $\pm125$ kyr, you just need to average 16 samples to get it down to $\pm31$ kyr. The uncertainty in the addition (or substraction) of two or more quantities is equal to the square root of the ...