PLATE XIV. 



IDKALIZED STRUCTURAL MAP AND DETAIL GEOLOGICAL MAP, WITH SECTIONS, TO SHOW THE DISTRIBU- 

 TIOX AND STRUCTURE OF THE HURONIAN ROCKS IN THE VICINITY OF CRYSTAL FALLS, JIICHIGAX. 



Idealized structural map of the viciuity of Crystal Falls. An attempt has been made to 

 illustrate upon this map the distribution of the Hurouiau rocks, and at the same time our eonceptiou 

 of the general features of the structure of this area. The drainage is merely introduced fur the 

 purpose of orientatiou. The topography as here represeuted does not agree with the true topogra|ihy 

 of the area. The bottom of the geological basin now occupies, as the result of erosion, the highest 

 places topographically. 



Detail geological map, with sections, to show the distribution and structure of the Huronian 

 rocks in the immediate vicinity of Crystal Falls. This serves as a key to the accompanying idealized 

 structural map. 

 160 



