FORMATIONS AND PHYSICAL HISTORY 409 



!'!. 359. Map of North America, showing the outcrops of the Upper Devonian 

 formations, and the general relations of land and water in late Devonian time. The 

 conventions are the same as in earlier maps (see p. 347). (See note under Fig. 358 

 concerning the Devonian in the north wtst. Note also the interrogation marks in 

 the lower Mississippi basin.) 



