The Harris matrix approach for performing this task was an extension of another method developed by (*) Flinders Petrie.
One method of performing this task divides the square of the width of a rim by the diffusion coefficient, and is based on Irving Friedman's empirical equation. Obsidian hydration is one method of performing this task, another method of which finds the lengths of etched tracks created by neutrons. Contamination in one method of performing this task can be accounted for by using a Concordia diagram. The Harris matrix approach for performing this task was an extension of another method developed by (*) Flinders Petrie. One widely-used method for performing this task is aided by plotting an isochron. Fission-track methods and seriation are two methods of doing this, and another method comes in rubidium-strontium, potassium-argon, and carbon-14 varieties, whose utility is determined by their half-lives. For 10 points, name this task which is often accomplished by charting the decay of radioactive isotopes, which tries to find the age of a particular layer of rock.
One method of performing this task divides the square of the width of a rim by the diffusion coefficient, and is based on Irving Friedman's empirical equation.
dating [accept reasonable equivalents; accept specific types of dating until they’re mentioned]