prehistoric epochs
Dinosaurs roamed then
Prehistoric epochs are the major divisions of Earth's history before written records, spanning billions of years from the planet's formation through the emergence of early humans.
Geologists and paleontologists divide this time into eras, periods, and epochs—the Jurassic, the Pleistocene, the Cambrian—each marked by distinct life forms and geological conditions.
The phrase often evokes deep time and dramatic change: Fossils from prehistoric epochs reveal creatures unlike anything alive today.
- JurassicDinosaur-dominated geological period
- CretaceousFinal Mesozoic period
- TriassicFirst Mesozoic period
- dinosaursExtinct prehistoric reptiles
- fossilsPreserved ancient organism traces
fossil record · extinction · ice age · Cambrian · Paleozoic · Mesozoic · Cenozoic · megafauna · mammoths · amber · tar pits · sediment · geological · deep time · strata · primordial · ancient · mass extinction
prehistoric epochshistorical periods
Named spans of past time
recorded history · antiquity · ancient history · medieval period · modern history
prehistoric epochsmodern era
Current historical period
contemporary times · modern age · digital age · posterity · the here and now
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