geologic history
Planet's ancient record
Geologic history is the record of Earth's physical development over billions of years—the formation of rocks, shifting of continents, rise and erosion of mountains, and succession of life forms preserved as fossils.
Scientists reconstruct geologic history through rock layers, radiometric dating, and fossil evidence: The Grand Canyon exposes two billion years of geologic history in its walls.
- PrecambrianEarliest geological eon
- stromatolitesLayered sedimentary bacterial structures
- plate tectonicsEarth's crust mobility theory
- fossilsPreserved ancient organism traces
- mass extinctionLarge-scale species elimination
Cenozoic · asteroid impact · paleomagnetism · stratigraphy · erosion · metamorphism · supercontinent · trilobites · deep time · dinosaurs · volcanism · sedimentation · radiometric dating · carbon dating · ice ages · core samples · Quaternary · cyanobacteria
geologic historyhuman history
Record of civilization's events
recorded history · current events · modern history · contemporary history · the present
geologic historyhuman history
Record of civilization's events
political history · cultural history · social history · economic history · art history
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