geologic period
- JurassicDinosaur-dominated geological period
- CretaceousFinal Mesozoic period
- TriassicFirst Mesozoic period
- CambrianEarliest Paleozoic period
- fossilPreserved ancient organism
dinosaur · extinction · strata · ancient · sediment · layer · formation · Paleozoic · Mesozoic · Cenozoic · Devonian · Carboniferous · Permian · bedrock · prehistoric · timescale · million · primordial
temporal scale
geologic periodinstant
Briefest unit of time
moment · second · minute · heartbeat · blink of an eye
time division type
geologic periodcalendar year
Full twelve-month period
fiscal quarter · calendar month · news cycle · election cycle · fiscal year