EXPLANATION OF PLATES 



PLATE 7 



Map of the life zones of the Pine Porest Mountain region, taken from the 

 Disaster Sheet of the United States Geological Survey Topographic Map 

 of the United States. The dotted line beginning at Quinn Eiver Crossing 

 indicates the route followed by the expedition. Squares indicate base- 

 camps (where most of the time was spent), triangles, collecting localities. 

 The route followed by the palaeontological party is not indicated. 



It should be understood that the Ufe zones as plotted are to be regarded 

 as approximately accurate along the route of the expedition only. At a 

 distance from the line of actual work the zones are based on inference 

 from altitudes, slope-exposure, and distant observation. 



[426] 



