Figure 6. — Map showing the 18 mountain ranges sampled at "detailed" level and isolines 

 of the average percent cover of juniper relative to average total tree cover on 

 these cover on these ranges. The average values for the mountain ranges are listed 

 in table 4. 



western Utah, where the mountain ranges are only moderately high. The most northerly 

 mountain ranges, such as the Goose Creek Range in northwestern Utah and Black Pine Peak 

 Range in Idaho, contain predominantly pure stands o£ juniper trees. Many unsampled 

 mountain ranges located in northern Nevada are also dominated by or contain only juniper 

 (West and others 1978). 



The plots were stratified according to their elevational intervals, and the 

 average relative percent cover of pinyon and juniper was computed for each elevational 

 interval. The results show that at 1,600 m juniper is completely dominant (100 percent 



18 



