How accurate is potassium argon dating
The advantage is that all the information needed for dating the sample comes from the same argon measurement. This method is commonly called "argon-argon dating." The Ar-Ar method is considered superior, but some of its problems are avoided in the older K-Ar method.Also, the cheaper K-Ar method can be used for screening or reconnaissance purposes, saving Ar-Ar for the most demanding or interesting problems.
Young rocks have low levels of The rock samples are crushed, in clean equipment, to a size that preserves whole grains of the mineral to be dated, then sieved to help concentrate these grains of the target mineral.
Lava flows that lie above and below rock beds with ancient human fossils are a good—and true—example.