geochronologist
/ˌdʒiːoʊkrəˈnɑːlədʒɪst/
noun
- A scientist who studies the age of rocks, fossils, and other geological materials to determine the history of the Earth.
- As a geochronologist, she spent months analyzing samples from the Grand Canyon.
- The geochronologist used radioactive dating to find the age of the ancient lava flow.
- The university hired a geochronologist to help date the fossils discovered in the cave.