[js1138]

It will be interesting to see the responses to this. It assumes, of course, that the earth is at least 500 million years old and that various dating methods are accurate...

[r9etb]

It will be interesting to see the responses to this. It assumes, of course, that the earth is at least 500 million years old and that various dating methods are accurate...

(smirk)

Actually, the stated frequency 143 million years (plus or minus) depends on the accuracy of their historical T, pCO₂, and other indicators. Lots of assumptions therein....