knowlton.1 LOCALITIES. 9 
already pointed out, it has since been shown that the Point of Rocks 
flora belongs also to the Montana formation, being below some 700 or 
800 feet of marine Cretaceous. In the light of this information a new 
comparison of the plants from the two localities emphasizes their simi- 
larity and evident affinity. Thus the plants from Coalville have been 
referred to ten species, of which number two or three are either new to 
science or not specifically determinable, and of the remainder three or 
four are found at Point of Rocks. 
OTHER LOCALITIES. 
The Montana formation has an extensive geographical distribution 
beyond the areas before treated, being especially prominent in southern 
and western Colorado and in northern New Mexico; yet within all this 
vast area not a single fossil plant has been reported, with the possible 
exception of the more or less doubtful Halymenites major. Coal beds of 
greater or less extent occur, and plant-bearing horizons have often 
been noted, or there has been at least some hint of their presence. All 
paleobotanical work in this area remains for the future, and the most 
that can be done at present is to indicate a number of localities which 
would seem to promise favorable results when suitably exploited. 
The upper portion of the Cretaceous within this area consists of coal- 
bearing sandstones and shales that have been referred to the Fox 
Bills, on the ground that marine Cretaceous invertebrates were found 
ibove the coal. This condition was noticed by Holmes 1 and Newberry 2 
m southwestern Colorado, and by Peale 3 and White 4 in western Colo- 
rado — observations that have been abundantly confirmed by R. C. 
Bills. 5 In the Geological Atlas of Colorado, prepared by the Hayden 
survey, the formations are marked "Fox Hills," as above indicated, 
[n 1893, Mr. T. W. Stanton 6 found, in Mancos Canyon, characteristic 
Fox Hill invertebrates from 800 to 1,000 feet above the base of the 
joal-bearing sandstones. 
Prof. J. J. Stevenson, in his report on the geology of Colorado in 
Wheeler's survey, 7 noted the presence of Halymenites major in numerous 
ocalities in southern Colorado, and also spoke of dicotyledonous leaves 
n the Upper Cretaceous; but it should be remembered that he referred 
;he whole of the Rocky Mountain coal beds to the Cretaceous, a conten- 
ion that was long ago abandoned. 
BELLY RIVER FLORA AND ITS RELATION TO THE 
MONTANA FLORA. 
It seems necessary, in the present connection, to say something of 
;he Belly River flora and its probable relation to the Montana flora. 
■AnD. Rept. TJ. S. Geol. and Geog. Surv. Terr., 1875, pp. 242-267. 
2 Rept. Macomb's Expl. Exped., p. 77 (1876). 
3 lbid., 1874, pp. 128-155, 1876, pp. 170-180. 
4 Ibid., 1876, pp. 19, 28-34. 
5 Proc. Colo. Sci. Soc, Vol. Ill, No. Ill, pp. 379 et seq. (1890). 
6 Bull. U. S. Geol. Survey, No. 106, p. 32 (1893). 
7 Rept. on the Geog. and Geol. Expl. and Survey West of the 100th Meridian, pp. 307-488 (1875). 
