Start What is being measured in radiometric dating

What is being measured in radiometric dating

The layers of rock are known as "strata", and the study of their succession is known as "stratigraphy".

A common form of criticism is to cite geologically complicated situations where the application of radiometric dating is very challenging.

They are applied by geologists in the same sense that a "null hypothesis" is in statistics -- not necessarily correct, just testable.

In the last 200 or more years of their application, they are valid, but geologists do not assume they are.

Despite this, the "principle of cross cutting relationships" can be used to determine the sequence of deposition, folds, and faults based on their intersections -- if folds and faults deform or cut across the sedimentary layers and surfaces, then they obviously came after deposition of the sediments.