92 FOREST DISTRIBUTION 



almost the whole of the forest, but above 8000 feet gives place 

 to white bark pine, alpine fir and Engelmann spruce. The 

 upper timber line occurs at elevations of 9300 to 9800 depend- 

 ing on direction or exposure, though on the Beartooth ilountains 

 toward the east it ascends in places to 11,000 feet. At the timber 

 line Engebnann spruce is the dominant and most conspicuous 

 species. 



Table 19. The Forests of the Yellowstone Section. 



The above species are all represented in this section, though 

 some of them very sparingly, and the yellow pine probably the 

 least of all. The above figures were tabulated from Forest 

 Service data and have the advantage of being the most recent 

 obtainable. Leiberg, (31"). however, gives a somewhat different 

 and more detailed account as follows : 



Pinus fltxiUs - - 2.3'~; 



coniorta - 45.6 



" ponderosa - - - .005 



" alhicaulis - - 5.3 



Picca Engelmaimii _ 21. '^ 



Pseudotsuga tarifoUa .— — . 12.2 



Abies lasiocarpa — - 11.1 



In this estimate trees are considered of three inches basal 

 diameter and upwards. Leiberg states that the lodgepole pine 

 forms fully 75''f of the forests below the subalpine zone, and 

 even as mueh as 'MV'c in its own proper belt alxive the lower 

 fringe ixeupied by Douglas spruce and limber pine. Leiberg 

 cites also the occurrence of Pin us monticola in one locality in 

 the Absarokas but this is very doubtful, as it there would appear 

 to be in a locality far removed from its known range and in the 

 only position reported for it cast of the Eivide. As it is not 



