The principle of superposition states that... Within a sequence of undisturbed sedimentary or volcanic rocks, the layers get younger going from bottom to top. It can be used for relative age dating ...

How archaeologists determine the date of ancient sites and artifacts From radiocarbon dating to comparing designs across the ages, archaeologists gather clues to calculate the age of artifacts.

Here the authors test the weak equivalence principle in the quantum regime with high sensitivity using a Bragg atom interferometer with rubidium atoms in their hyperfine states.