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important events in earths history
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28
Science
11th Grade
09/24/2013
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Term
4.56 billion years
 Definition
Earth forms
Term
4.4 billion years
 Definition
oldest mineral grain found
Term
4.1 billion years
 Definition
oldest piece of rock ever found
Term
3.9 billion years
 Definition
oldest evidence of a continent
Term
3.8 billion years
 Definition
first evidence of life
Term
3.5 billion years
 Definition
first fossils (algae and bacteria)
Term
1.8 billion years
 Definition
Free oxygen in atmosphere
Term
1.1 billion years
 Definition
first fossil of a complex organism (a worm)
Term
540 million years
 Definition
first abundant life found in the rock record
Term
460 million years
 Definition
first fish
Term
440 million years
 Definition
first land plants
Term
410 million years
 Definition
first land animals
Term
250 million years
 Definition
largest mass extinction
Term
247 million years ago
 Definition
first dinosaurs
Term
240 million years
 Definition
first mammals
Term
220 million years
 Definition
break up of super continent Pangea begins
Term
145 million years
 Definition
first flowering plants
Term
65 million years
 Definition
dinosaurs and other animals go extinct
Term
30 million years
 Definition
mammals/flowering plants become abundant
Term
5 million years
 Definition
beginning of cascade
Term
1.8 million years
 Definition
first primate in genus homo
Term
40,000 years
 Definition
first homo species
Term
13,000 years
 Definition
humans first inhabit north america
Term
10,000 years
 Definition
end of last ice age
Term
8,000 years
 Definition
founding of jericho, the first known city
Term
2,000 years
 Definition
Roman domination of the world
Term
500 years
 Definition
european rediscovery of the americas
Term
34 years
 Definition
humans first explore the moon
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