Before I begin, there is one set of terms you should be able to distinguish: radiometric dating is a method of estimating the age of geological events using radioactive isotopes in minerals; radioactive dating occurs in the storage room at the nuclear power plant and has very little to do with geology.Confusion of these terms is a sure sign of geological ignorance.This definition can be misleading, however, without some qualification.First, all radiometric dating methods are scientific models used to estimate the age of geologic events, provided a number of physical assumptions regarding the rock's history are met.In this sense, it is much like estimating the origin of a cannonball in flight, using a set of physical observations and the laws of gravity.Secondly, radiometric dating methods (K-Ar in particular) do not estimate the age of a rock, but the time at which a mineral in that rock was last near a given temperature (called the closing temperature).Therefore, one can use the measured ratio of potassium to argon in a given mineral to infer the time at which the mineral crystallized and began to accumulate argon (note: 40Ca is not considered in the equation, because it is a common isotope that is already abundant in the rock).Typically, one assumes that no argon (or negligible amounts thereof) was initially present, because argon is a noble gas and can easily diffuse out of minerals that are still hot.

I imagine that I will return to this topic some time in the future, as Ai G has published a number of articles and books that discuss radiometric dating methods (and the Potassium-Argon method in particular).If you came back after 1.25 billion years, and assuming nobody has heated the rock or altered it chemically, you would find 1/2 grams of 40K and 1/2 grams of 40Ar/40Ca.After another 1.25 billion years, you should find 1/4 grams of 40K and 3/4 grams of 40Ar/40Ca.Is there a grand conspiracy to hide the flaws, which are so simple to point out? Doolan first explains that the largest volcano is the youngest.This is true, but he does so in a way that would make you think scientists either doubted that young age, or figured they could use K-Ar dating to come up with a "final answer." (If you did not get this impression from the first paragraph, then my point here is invalid, but I'll continue nonetheless) First, Mr.