The study of earth history by correlating archaeological events to the timing and sequencing of geological events. Specifically, it is the dating of archaeological data in association with a geological deposit or formation, such as the dating of Pleistocene human remains in the context of glacial advances and retreats. The term is applied to all absolute and relative dating methods that involve the earth's physical changes, like radiocarbon dating, dendrochronology, archaeomagnetism, fluorine testing, obsidian dating, potassium-argon dating, thermoluminescence, and varve dating.