728 GEOLOGY OF THE YELLOWSTONE Is^ATIOXAL PAliK. 



These leaves agree well with the usual descriptidii and hgures of this 

 species, es])ecially as given by Lesquereitx^ from Carbon, Wyoming. 



Habitat: Fossil Forest Ridge, Yellowstone National I'ark, bed No. 1, 

 the lowest IkmI, rare: l)ed No. ii, rare: bed No. 6, the " Platanus l)ed," 

 most abundant looalitv, over To specimens noted; l)ed No. 7, rare; collected 

 by Lester F. "Wai-d nnd F. H. Knowlton, August, 1887. East end of Fossil 

 Forest Mountain, middle bed, 775 feet above valley beloAv; specimens rare; 

 collected by Ward and Knowlton, August 13 and 22, 1887. Specimen Ridge, 

 0})posite Slough Creek, rare; collected by Ward and Knowlton, August, 

 1887. Hague's Yellowstone National Park collections (field No., 1!I60), 

 Fossil Forest section, very abitndant; collected b}' CI. M. Wright and Walter 

 H. Weed, September 20, 188;"). Hague's Yellovrstone National Park col- 

 lections (field No., 1217), Fossil Forest section, up})er stratum; collected by 

 Arnold Hague, September 24, 1884. Hague's Yellowstone National Park 

 collections (field No., 1219), rare; collected by Arnold Hague, September 

 24, 1884. South end of Crescent Hill, 6 feet l)elow "Platanus l>ed;" 

 collected l)y F. H. Knowlton, August 9, 1.S8S. 



Platanus Montana n. sp. 

 PI. XCYI, ligs. 2, 3. 



Leaves membranaceous, somewhat roughened, rounded-oblong in 

 shape, decurrent on the pL4iole, rounded al)ove or acuminate, possibly 

 slightlv 3-])ointed; margin sim})lv undulate tootlied ; nervation obscurely 

 palmate; petiole stout; niidril) thick, straight ; secondaries several (about 

 ;")") ])airs, the lowest some distance above the base of the blade, emerging at 

 an angle of about 30^. ])assing nearly straight to the border and ending in a 

 small inai'ginal tootli, Vvith several branches on the outside approximately 

 at right angles to the midrib and ending in marginal teeth; second pair of 

 secondaries strong, arising at an angle of 4.")°, nuu-h arching upward ami 

 ending either in the margin or possibly in short lol)es, with several strong 

 forking branches on the outside, the terminations ending in the teeth ; other 

 sec(mdaries also occasionalh' forked on the outside; nervilles strong, occasion- 

 ally percurrent, but mainly forked or broken; finer nervation quadrangular. 



This species is based on a numl)er of more or less fragmentary lea\es, 

 the best of which are figure<l. The most perfect specimen is 12 cm. 



1 Tert. Fl., i>. 183, PI. XXV, figs. 1-3. 



