92 



FORKS'!' DISTRIBUTION 



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

 to white l>ark pine, alpine fir and Kn^elnuinn spruce. The 

 upper timber line occurs at elevations of !):>()() to !>SOO depend- 

 ing on direction or exposure, though on the Heart ooth Mountains 

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

 line Kn.iivhmmn spruce is the dominant and most conspicuous 

 species. 



Table 1!). The Forests of the Yellowstone Section. 



The above species are all represented in this section, thonuh 

 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 : 



I'nnis flexilis 2.3$ 



" contorta 45. li 



" ponderosa 005 



" albicaulis 5.:: 



!'/<( a Engelmannii 21.8 



I's( adtifsHf/a fa.ri folia 12.2 



A hits lasiocarpa 11.1 



In this estimate trees are considered of three inches basal 

 diameter and upwards. Leihcrir states that the loduvpole pine 

 forms fully 75' '< of the fun-six below the snbalpine /.one. and 

 even ;IN much as !>O'r in its own |>rope?' belt above the lower 

 fi-in-je ...-.-iipied by |)onrl;is s|>nice and limber pine. Leibe? 1 ,^ 

 tin- ni-eiiri-enee of /'//;//\ nui I ic f>l n in one locality in 

 the Absai-okas but this is very doubtful, as it there would appeal- 

 to be in a I'M-ality far removed from its known ranire and in the 

 only position reported for it east of the l:ivide. As it is not 



