New Eras 



Eopaleozoic Ratw 5. Esti/nat 



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na 



37 



ime 2500.000 years. | tozc /^//^ Z Estimated time IOJO0.000 years. 



Mesozoic. Ratio 6. Estimated time 9.000.01)0 years 



Neozoic, flario 2.. 1 



tlewPeriods 



Taconic 1 

 6% 



coda 

 5% 



Ozarkic 

 9% 



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 w s'i 10 7 



c Devon ic 



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87. 



', r 

 77. 



Pennsylvanic 

 /2 7. 



Permic 



97. 



Tr lassie 

 257. 



Jurassl 

 257. 



Comanchic C re facie 

 207. 307. 



Eogenic 

 SO 7. 



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Old Periods 



207- 



rd o v i c i a n Situ 

 23 V- io 



rian Devonian 

 % n% 



Mississippian 



Pennsylvania 



IZ7. 



Permian 



97. 



Triass/c 

 25 7- 



Jurassic Comanct 

 257. 257. 



ic Cre t a c i c 



30 7. 



Eogenic 



N eogenic 

 507- 



Old Eras 



Paleozoic. Ratio 12. Estimated time 18.000.000 years. 



M e s o z o i c 



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