phanerozoic
/ˌfænərəˈzoʊɪk/
adjective
- Relating to the most recent eon of geological time, from about 541 million years ago to the present, when abundant animal and plant life with hard parts appeared in the fossil record.
- The Phanerozoic eon includes the time when dinosaurs roamed the Earth.
- Fossils from the Phanerozoic are much more common than those from earlier eons.
- Geologists study Phanerozoic rocks to understand the evolution of complex life.
Antonyms