As new locations are investigated, the geologist attempts to fit the new profiles into the master sequence of geological strata for that region.
Radioactive elements are unstable; they breakdown spontaneously into more stable atoms over time, a process known as radioactive decay.
Radioactive decay occurs at a constant rate, specific to each radioactive isotope.
Stratigraphic dating is accomplished by interpreting the significance of geological or archaeological strata, or layers.
The method begins with the careful drawing and description of strata (the geological or archaeological profile).
Seriation is an archaeological technique involving the description of stylistic changes in artifacts and of changes in the popularity of distinct styles in order to accurately describe the sequence of variation over time.