Bob February 2, 2017 11:49 AM I have always wondered if the different isotopes were simply deposited at the same time and had very little to do with true age. JimFox February 2, 2017 12:56 PM Y.E. Creationists will be gloating! Dan Werner February 2, 2017 01:52 PM So, is it off by millions of years or billions of years or are they at least in the universal ballpark. Lardo February 2, 2017 01:58 PM I made this same argument (other, perhaps even unknown, variables) to my high school science teacher... way back in 1972. He told me I was an idiot, and that the science of radioisotope dating was settled.Oops. Primecordial February 2, 2017 02:06 PM Hmmmm....if the facts don't fit the theory, change the facts. Dan Lewis February 2, 2017 03:14 PM Mistakes aside, the age of rocks are STILL MUCH OLDER than the outrageous 12 Thousands years maximum posited by the deluded 'young earth' silly people.Religion comforts...and cripples. History is quite clear on the matter. Fretting Freddy the Ferret pressing the Fret February 2, 2017 03:19 PM Aha! Take that Science! The Earth is 5000 years old! /notseriousatall Peter Debney February 2, 2017 03:21 PM Radioisotope dating is not the only option, and any scientist exercising due diligence will use a number of methods. For example Potassium-Argon dating does not rely on assumptions of the initial distribution of the two elements as any Argon present in the molten rocks will bubble out leaving just Potassium present. Any Argon subsequently found to be present will be there due to Potassium decaying into Argon. Thus from our knowledge of the half-life of Potassium and the ratio between the two can give us a good estimate of the time since the rock crystallised. habakak February 2, 2017 03:24 PM '...our understanding of Earth's ancient timeline could be worryingly inaccurate....'. No surprise here. I am sure the earth is many millions of years old, possibly hundreds of millions. Or even billions. I am not sure. But I do know that we most likely are wrong by a pretty wide margin. It's just a shame I won't be around in 200 years or when we figure it out. So that I can laugh at 2017-man for his misunderstandings! John Gochnauer February 3, 2017 06:42 PM *yawn* It's not like I believed this "millions of years" foolishness to begin with.