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The History of the Earth Timeline
Some Important Events in Earth's History
27
Science
12th Grade
09/24/2013
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Term
4.56 Billion Years Ago
 Definition
Earth froms.
Term
4.4 Billion Years Ago
 Definition
Oldest mineral grain found.
Term
4.1 Billion Years Ago
 Definition
Oldest piece of rock ever found
Term
3.9 Billion Years Ago
 Definition
Oldest evidence of a continent.
Term
3.8 Billion Years Ago
 Definition
First evidence of life.
Term
3.5 Billion Years ago
 Definition
First fossils (algae & bacteria)
Term
1.8 Billion Years Ago
 Definition
Free O2 in Atmosphere.
Term
1.1 Billion Years Ago
 Definition
First fossil of a complex organism (a worm)
Term
540 Million Years Ago
 Definition
First abundant life found in the rock record.
Term
460 Million Years Ago
 Definition
First fish.
Term
440 Million Years ago
 Definition
First land plants.
Term
410 Million Years Ago
 Definition
First land animals.
Term
250 Million Years Ago
 Definition
Largest mass extinction.
Term
247 Million Years Ago
 Definition
First dinosaurs.
Term
240 Million Years Ago
 Definition
First mammals.
Term
220 Million Years Ago
 Definition
Break up of super continent Pangaea begins.
Term
145 Million Years Ago
 Definition
First flowering plants.
Term
65 Million Years Ago
 Definition
Dinosaurs and other animals go extinct.
Term
30 Million Years Ago
 Definition
Mammals/flowering plants become abundant.
Term
5 Million Years Ago
 Definition
Beginning of Cascade.
Term
1.8 Million Years Ago
 Definition
First primate in genus Homo.
Term
40,000 Years Ago
 Definition
First Homo sapiens
Term
13,000 Years Ago
 Definition
Humans first inhabit North America.
Term
10,000 Years Ago
 Definition
End of the last Ice Age.
Term
2,000 Years Ago
 Definition
Roman domination of the World.
Term
500 Years Ago
 Definition
European rediscovery of the Americas
Term
~34 Years Ago
 Definition
Humans first explore the moon.
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