4.56 billion years ago

earth forms

4.4 billion 

oldest mineral grain found

4.1 billion

oldest piece of rock ever found

3.9 billion 

oldest evidence of continent

3.8 billion

first evidence of life

3.5 billion

first fossils (algae & bacteria)

1.8 billion

free o2 in atmosphere

1.1 billion

first fossil of a complex organism (worm)

540 million

first abundant life found in the rock record

460 million

first fish

440 million

first land plants

410 million

first land animals

250 million

largest mass extinction

247 million

first dinosaurs

240 million

first mammals

220 million 

break up of super continent pangaea begins

145 million

first flowering plants

65 million

30 million

mammals/flowering plants become more abundant

5 million

beginning of cascade

1.8 million

first primate in genus homo

40,000

first homo sapiens

13000

humans first inhabitant north america

10000

end of last ice age

8000

founding of jericho the first known city

2000

roman domination of the world

500 

europeans rediscover of the americans

~34

humans first explore the moon