geochronology (n.)

word-forming element meaning "earth, the Earth," ultimately from Greek geo-, combining form of Attic and Ionic gē "the earth, land, a land or country" (see Gaia).

1590s, "the science of time," from French chronologie or directly from Modern Latin chronologia; see chrono- + -logy. Related: Chronologer (1570s). Meaning "particular statement of the supposed order of certain past events" is from 1610s.