geological ages
Planetary time divisions
Geological ages are the vast time periods into which Earth's history is divided, spanning millions or billions of years.
Geologists organize these into a hierarchy—eons, eras, periods, epochs—based on rock layers and fossil evidence.
Dinosaurs dominated during the Mesozoic Era.
In casual use, geological ages suggests an impossibly long time: I haven't seen her in geological ages.
- JurassicDinosaur-dominated geological period
- CretaceousFinal Mesozoic period
- TriassicFirst Mesozoic period
- CambrianEarliest Paleozoic period
- PaleozoicEarly complex-life epoch
Mesozoic · Cenozoic · fossil · fossil record · dinosaur · mass extinction · epoch · era · eon · Permian · extinction · strata · rock layers · sediment · prehistoric · ancient · ancient history · million
- Prehistoric Timesprehistory, ancient times, Stone Age, Bronze Age, Iron Age
- creationismcreation, creator, young earth, creation science, creation story
geological agesmoments
Short spans of time
instants · recorded history · seconds · human history · minutes
geological ageshistorical periods
Named spans of past time
human history · recorded history · social time · news cycles · lifetimes
geological, geologic, geologically, geology, geologist, geologists, ages, ageing, geometry