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Earth history timeline
ess
28
Geology
12th Grade
09/24/2013
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Term
4.56 Billion
 Definition
earth forms
Term
4.4 Billion
 Definition
oldest mineral grain found
Term
4.1 Billion
 Definition
oldest pieace of rock ever found
Term
3.9 Billion
 Definition
oldest evidence of a continent
Term
3.8 Billion
 Definition
first evidence of life
Term
3.5 Billion
 Definition
first fossils (algae & bacteria)
Term
1.8 Billion
 Definition
free 02 in atmosphere
Term
1.1 Billion
 Definition
first fossil of a complex organism (a worm)
Term
540 million
 Definition
first abundant life found in the rock record
Term
460 million
 Definition
first fish
Term

440 million

 

 Definition
first land plants
Term
410 million
 Definition

first land animals

 
Term
250 million
 Definition
largest mass extinction
Term
247 million
 Definition
first dinosaurs
Term
240 million
 Definition
first mammals
Term
220 million
 Definition
break - up of super continent pangaea begins
Term
145 million
 Definition
first flowering plants
Term
65 million
 Definition
dinosaurs and other animals go extinct
Term
30 million
 Definition
mammals/flowering plants become abundant
Term
5 million
 Definition
beginning of cascade
Term
1.8 million
 Definition
first primate in genus homo
Term
40,000
 Definition
first homo sapiens
Term
13,000
 Definition
humans first inhabit north america
Term

10,000

 

 Definition
end of last ice age
Term
8,000
 Definition
founding of jericho, the first known city
Term
2,000
 Definition
roman domination of the world
Term
500
 Definition
European rediscovery of the americas
Term
~34
 Definition
humans first explore the moon
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