geological period
Span of ages
A geological period is a division of Earth's history spanning millions of years, defined by distinctive rock formations, fossils, and major changes in life forms.
Periods like the Jurassic, Cambrian, and Cretaceous are grouped into larger eras and subdivided into epochs.
Dinosaurs dominated during the Jurassic period.
- eraDistinct historical period
- epochDistinct historical period
- time scaleDuration measurement system
- JurassicDinosaur-dominated geological period
- CretaceousFinal Mesozoic period
Cambrian · Triassic · Permian · Carboniferous · Devonian · Silurian · Ordovician · Precambrian · Holocene · prehistoric life · Pleistocene · ice age · Mesozoic · mass extinction · Paleozoic · Cenozoic · eon · age
geological periodinstant
Briefest unit of time
moment · split second · millisecond · nanosecond · fleeting moment
geological periodcalendar year
Full twelve-month period
recorded history · lifetime · news cycle · reign · dynasty
geological, geologic, geology, geologist, geologists, geologically, period, periods, periodic