millions of years
- epochsDistinct historical stretches
- ancientVery old indeed
- prehistoricBefore documented civilization
- dinosaursExtinct prehistoric reptiles
- fossilsPreserved ancient organism traces
geological · deep time · evolution · extinction · primordial · ice ages · continental drift · sediment · strata · amber · petrified · aeons · timescale · radiometric · carbon dating · tectonic · primeval · immemorial
temporal duration/scale
millions of yearsmilliseconds
Thousandths of a second
seconds · microseconds · nanoseconds · minutes · hours
human temporal perception
millions of yearsright now
At the present moment
recorded history · today · yesterday · the here and now · modern era