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the history of the earth timeline
some important events in earths history.
27
Geology
12th Grade
09/24/2013
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Term
Earth forms
 Definition
4.6 billion
Term
oldest mineral found in grain
 Definition
4.4 billion
Term
oldest evidence of a continent
 Definition
4.1 billion
Term
first evidence of life
 Definition
3.8 billion
Term
first fossils (algae & bacteria)
 Definition
3.5 billion
Term
free O2 in atmosphere
 Definition
1.8 billion
Term
first fossil of a complex organism (worm)
 Definition
1.1 billion
Term
fist abundant life found in the rock record
 Definition
540 million
Term
first fish
 Definition
460 million
Term
first land plants
 Definition
440 million
Term
first land animals
 Definition
410 million
Term
large mass extension
 Definition
250 million
Term
first dinosaurs
 Definition
247 million
Term
first mammals
 Definition
240 million
Term
break-up of super continent pangaea begins
 Definition
220 million
Term
first flowering plants
 Definition
145 million
Term
dinosaurs and other animals go extinct
 Definition
65 million
Term
mammals/flowering plants become abundant
 Definition
30 million
Term
beginning of cascade
 Definition
5 million
Term
first primate in genus homo
 Definition
1.8 million
Term
first homo sapiens
 Definition
40,000
Term
humans first inhabit north America
 Definition
13,000
Term
end of last ice age
 Definition
10,000
Term
founding of jericho, the fist known city
 Definition
8,000
Term
roman domination of the world
 Definition
2,000
Term
european rediscovery of the americas
 Definition
500
Term
humans first explore the moon
 Definition
~34
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