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We are told that these methods are accurate to a few percent, and that there are many different methods.We are told that of all the radiometric dates that are measured, only a few percent are anomalous.Note how the oldest rocks in the Grand Canyon are on the bottom and the youngest rocks are on the top (more about layers).: Carbon-14 is the best known radiometric dating technique, but it can only be used to date objects younger than about 40,000 years.It also only works for objects that contain carbon.
Along the left side, it also gives the approximate age of each layer in millions of years.
After study and discussion of this question, I now believe that the claimed accuracy of radiometric dating methods is a result of a great misunderstanding of the data, and that the various methods hardly ever agree with each other, and often do not agree with the assumed ages of the rocks in which they are found.
I believe that there is a great need for this information to be made known, so I am making this article available in the hopes that it will enlighten others who are considering these questions.
Fossils are generally found in sedimentary rock not igneous rock.
Sedimentary rocks can be dated using radioactive carbon, but because carbon decays relatively quickly, this only works for rocks younger than about 50 thousand years.