Learn about Earth’s history through the geological time scale.
The timeline that organizes Earth's history into eons, eras, periods, and epochs
The largest division of time on the geological time scale
The era known as the "Age of Dinosaurs"
The period in which modern humans first appeared
The eon that represents the time before the appearance of complex life
Eon that represents the time when the Earth was forming and molten
Eon when the Earth cooled enough for continents and the earliest life forms to appear
Eon when the first complex life forms appeared
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The timeline that organizes Earth's history into eons, eras, periods, and epochs
Geological Time Scale
The largest division of time on the geological time scale
Eon
The era known as the "Age of Dinosaurs"
Mesozoic Era
The period in which modern humans first appeared
Quaternary Period
The eon that represents the time before the appearance of complex life
Precambrian
Eon that represents the time when the Earth was forming and molten
Hadean
Eon when the Earth cooled enough for continents and the earliest life forms to appear
Archean
Eon when the first complex life forms appeared
Proterozoic
Eon of visible life, includes the Paleozoic, Mesozoic, and Cenozoic eras
Phanerozoic
Era within the Phanerozoic Eon known for the explosion of life
Paleozoic Era
Era within the Phanerozoic Eon known for the rise of mammals
Cenozoic Era
Their role in defining geological periods
Fossils
A period within the Mesozoic Era when dinosaurs dominated the land
Jurassic period
The period within the Paleozoic Era when most of the major groups of animals first appear in the fossil record
Cambrian Period
Period known for its two major ice ages
Quaternary Period
Event that saw the rapid appearance of most major animal phyla
Cambrian Explosion
Events that define geological boundaries, like the extinction of the dinosaurs at the boundary between the Cretaceous Period and the Tertiary Period
Extinction Events
Current epoch within the Quaternary Period, began about 12,000 years ago
Holocene epoch
Epoch within the Quaternary Period known for its Ice Ages
Pleistocene epoch
The time when the Earth was forming and was largely molten
Hadean Eon
Their role in shaping Earth's history, continents, and oceans
Plate Tectonics
Technique used to date materials such as rocks, based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products
Radiometric Dating
Its role in causing mass extinction events and shaping geological time
Climate Change
Their role in changing the course of life on Earth
Mass Extinctions
The concept of geologic time that encompasses Earth's entire history
Deep Time
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