564 



GEOLOGY 



Fig. 409. Map of North Amerirn showing the outcrops of the Hamilton 

 formation and the general relations of land and water during the 11 am 

 ilton epoch. The black area at the north probably includes Lower ;m<l 

 Upper Devonian as well as Middle. Compare Figs. 407 and 408. The 

 conventions are the same as in earlier maps. 



