728 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



These leaves agree well with the usual description and figures of this 

 species, especially as given by Lesquereux 1 from Carbon, Wyoming. 



Habitat: Fossil Forest Ridge, Yellowstone National Park, bed No. 1, 

 the lowest bed, rare; bed No. 5, rare; bed No. 6, the " Platanus bed," 

 most abundant locality, over 75 specimens noted; bed No. 7, rare; collected 

 by Lester F. Ward and F. H. Knowlton, August, 1887. East end of Fossil 

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

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

 opposite Slough Creek, rare; collected by Ward and Knowlton, August, 

 1887. Hague's Yellowstone National Park collections (field No., 1960), 

 Fossil Forest section, very abundant; collected by G. M. Wright and Walter 

 H. Weed, September 20, 1885. Hague's Yellowstone National Park col- 

 lections (field No., 1217), Fossil Forest section, upper 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 below "Platanus bed;" 

 collected by F. H. Knowlton, August 9, 1888. 



Platanus Montana n. sp. 

 PL XCYI, figs. 2, 3. 



Leaves membranaceous, somewhat roughened, rounded-oblong in 

 shape, decurrent on the petiole, rounded above or acuminate, possibly 

 slightly 3-pointed ; margin simply undulate toothed ; nervation obscurely 

 palmate ; petiole stout ; midrib thick, straight ; secondaries several (about 

 5) pairs, the lowest some distance above the base of the blade, emerging at 

 an angle of about 30°, passing nearly straight to the border and ending in a 

 small marginal tooth, with 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 45°, much arching upward and 

 ending either in the margin or possibly in short lobes, with several strong" 

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

 secondaries also occasionally forked on the outside; nervilles strong, occasion- 

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



This species is based on a number of more or less fragmentary leaves, 

 the best of which are figured. The most perfect specimen is 12 cm. 



'Tert. Fl., p. 183, PI. XXV, Jigs. 1-3. 



