地ち質しつ年ねん代だい学がくちしつねんだいがくMeanings1noungeochronologyScientific field that determines the age of rocks, fossils, and sediments, and establishes the geological time scale.地ち質しつ年ねん代だい学がくは、地ち球きゅうの歴れき史しを編あむための重