Pre AP Geo Oxygen Data

 

 

Millions of Years Before the Present

Percent of Atmospheric Oxygen

Events

0

21%

25

22%

50

23%

75

18%

100

17%

125

17%

150

16%

175

19%

200

15%

225

18%

250

28%

The Permian Event!

275

32%

300

35%

325

32%

350

25%

375

21%

400

18%

Rise of Vascular Plants

425

15%

450

14%

475

13%

500

13%

525

12%

550

13%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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