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History of the Earth timeline
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27
Science
12th Grade
09/24/2013
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Term
4.56 Billon
 Definition
Earth forms
Term
4.4 billon
 Definition
oldest mineral grain found
Term
4.1 billon
 Definition
oldest peice of rock ever found
Term
3.9 billon
 Definition
oldest evidence of a continent
Term
3.8 billon
 Definition
first evidence of life
Term
3.5 billon
 Definition
first fossiles(algae and bacteria)
Term
1.8 billon
 Definition
free O2 in atmosphere
Term
1.1 billon
 Definition
first fossil of a complex organisms
Term
540 millon
 Definition
first abundant life found in the rock record
Term
460 millon
 Definition
first fish
Term
440 millon
 Definition
first land plants
Term
410 millon
 Definition
first land animals
Term
250 millon
 Definition
largest mass extinction
Term
247 millon
 Definition
first donsaurs
Term
240 millon
 Definition
first mammals
Term
220 millon
 Definition
break up of super continent pangaea begins
Term
145 millon
 Definition
first flowering plants
Term
65 millon
 Definition
dinosaurs and other anumals go extint
Term
30 millon
 Definition
mammals/flowering plant become abundant
Term
5 millon
 Definition
beginning of cascade
Term
1.8 millon
 Definition
first primate in genus homo!
Term
40,000
 Definition
first homo sap[iens
Term
13,000
 Definition
humans first inhabit north american
Term
10,000
 Definition
end of last ice age
Term
8,000
 Definition
founding of jericho, the first known city
Term
500
 Definition
european rediscovery of the americas
Term
34
 Definition
humans first explore the moon
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