566 



GEOLOGY 



Fig. 410. Map of North America, showing the outcrops of the Upper De- 

 vonian formations, and the general relations of land and water in late 

 Devonian time. The conventions are the same as in earlier maps (see 

 p. 477). (See note under !'!;. lO'.i. mim-min-; the Devonian in tin- 

 northwest. Note also the interrogation marks in the lower Mississippi 

 basin.) 



