geological era
Ancient age span
A geological era is a major division of Earth's history spanning hundreds of millions of years, defined by distinct patterns in the fossil record and rock formations.
The current Cenozoic era began about 66 million years ago with the extinction of the dinosaurs.
Eras subdivide into periods, which subdivide into epochs.
The Mesozoic era is often called the Age of Reptiles.
- JurassicDinosaur-dominated geological period
- CretaceousFinal Mesozoic period
- PaleozoicEarly complex-life epoch
- MesozoicAge of Reptiles
- CenozoicPresent geological era
Triassic · Cambrian · epoch · period · eon · prehistoric · prehistoric life · dinosaurs · fossils · fossil record · mass extinction · extinction · ancient · primordial · primordial soup · strata · rock layers · sediment
- Earth historyice age, extinction, eons, fossil, epochs
geological erainstant
Briefest unit of time
moment · heartbeat · nanosecond · blink of an eye · millisecond
geological erageneration
Age-defined peer group
human history · recorded history · calendar year · modern era · fiscal year
geological, geology, geologic, geologist, geologists, geologies, geologically