STEVENSON— INTERRELATIONS OF FOSSIL FUELS. 133 



be distinguished ; yet in the western part the coals differ altogether. 

 The Paonia coals are subbituminous, with 15 to about 20 per cent, 

 of water, almost 17 of oxygen and less than 76 of carbon; whereas 

 the Bowie coals have less than 4 per cent, of water, 9 to 12 per cent. 

 of oxygen and from 79 to 83 per cent, of carbon. The Paonia coals 

 are at times rather high in ash, but the coal mined from the Bowie 

 is uniformly clean, the ash rarely exceeding 6 per cent. 



The jMesaverde coals are important in Sweetwater County of 

 Wyoming, within the Green River Basin. There, as in the Grand 

 Mesa area within the Uinta Basin, the coals are in two groups, 

 Almond and Rock Springs, which are separated by a greater interval 

 than the Paonia and the Bowie. The Almond coals are lower in 

 water than are those of the Paonia, but the oxygen is higher while 

 the carbon is from 72 to 76 per cent. The Rock Springs coals have 

 about 5 per cent, less of oxygen and the carbon varies little from 

 79 per cent. Farther north in Wyoming, within the Bighorn Basin, 

 a coal is mined near Cody which has 21 per cent, of oxygen and only 

 71 of carbon. ^^^ 



In Montana, the coal seams are more irregular than in southern 

 areas, the lenses, for the most, are of less extent and the coal is apt to 

 be dirty. The Judith River seams, or approximately the Upper 

 Mesaverde, are of subbituminous coal with water from 10 to 25 

 per cent., 16 to 20 per cent, of oxygen and 72, 73 to 76 per cent, of 

 carbon. But the coals of the Eagle sandstone are bituminous with 

 12 to 16 of oxygen and 76 to 80 per cent, of carbon. The ash 

 usually is high, 13 to more than 16 per cent. 



Dowling has published many analyses of Belly Rivers coals from 

 Alberta. They are proximate but they represent a great number of 

 localities The water rarely exceeds 5 per cent, in the Foothills 

 region but in the Lethbridge-Medicine Hat region it increases east- 

 wardly and, near ]\Iedicine Hat, it is about 20 per cent. The ash in 

 beds of workable thickness is low, seldom exceeding 8 per cent. Ac- 

 cording to two analyses of Lethbridge coal, published by Steb- 

 inger,^^° that fuel is on the borderland between subbituminous and 



139 u. S. Bureau of Mines, Bull. 22, pp. 67, 140, 141 for San Juan Basin; 

 PP- 55, 56 for Uinta Basin; pp. 313, 315, 316 for Green River Basin. 

 "0 E. Stebinger, Bull. 621-K, 1914, p. 138. 



PROC. AMER. PHIL. SOC, VOL. LVI, J, MAY 24, IQI/. 



