TABLE III 



GEOLOGIC TIME SCALE : DATES OF MAIN EVENTS SINCE THE 

 ORIGIN OF THE EARTH (iN MY) 



(from Kulp, 1960) 



500- 



1000- 



1500- 



2000- 



2500- 



3000- 



3500- 



4000- 



4500- 



5000 L- 



70 



220 



1600 

 1800 



3400 



4600 



Cenozoic 

 Mesozoic 



600 Paleozoic 



600-1400 Intermittent deposition on Russian platform 



900-1200 Grenville + Norwegian metamorphism 



1300-1400 Central + Southwestern U.S.A. 



Rapakivi 

 Svecofennidic, Ukraine 



500 



1000 



-1500 



2000 



2500-2800' Karelian - Kola, Ukraine, N.W. Scotland, 



West Australia, South Africa, Nigeria, Canadian Shield 



Kola Peninsula, oldest known rocks 



Probable age of the earth 



2500 



-3000 



3500 



4000 



4500 



5000 



