地ち質しつ年ねん代だい学がくMeaningsNoun1. geochronologyKanji used地ground質quality年year代substitute学studyComposed of地ち質しつgeological featuresNoun年ねん代だいage; era; period; dateNoun学がくlearning; scholarship; study; erudition; knowledge; education; study of ...; -ology; -icsNoun