130 STEVENSON— INTERRELATIONS OF FOSSIL FUELS- 



seams become thick and of economic importance. Two analyses of 

 the great Carbonero seam have been pubHshed, I. near Fruitland, 

 where the seam consists of bone, shale and coal, 12 feet, and at base 

 5 feet of coal, which was sampled; II. near Pendleton, where the 

 thickness is 48 feet, but only 7 feet were included in the sample. 



The Edmonton coals are subbituminous and break up on exposure ; 

 but this disintegration is much less rapid if the fuel be stored under 

 cover. Bowling has reported the results of numerous analyses, 

 which show no serious variation in composition of the pure coal; it 

 suffices to cite three from the upper group, which includes the great 

 seam on Pembina River, and one from the Clover Bar group several 

 hundred feet lower in the section. 



Coals of the Clover Bar group appear to be less advanced in con- 

 version than those of the higher group ; three samples from different 

 mines yielded 43, 45 and 47 per cent, of volatile. The ash rarely 

 exceeds 8 per cent.^^' 



The Fox Hills coals. The coals taken by the writer to be of 

 Fox Hills age are irregular but they are better than those of the 

 Laramie, within the United States ; and in some extensive areas they 

 are of great economic importance. Along the eastern base of the 

 Front ranges, these coals are mined on large scale in several fields 

 from New Mexico almost to the Colorado-\\'yoming line ; in much 

 of the region the seams are broken more or less by bony partings, but 

 these are separated readily and they have not been included in the 

 samples taken for analysis. Of the analyses. Numbers I. to V. are 



137 U. S. Bureau of Mines, Bull. 22, p. 141 ; D. B. Bowling, Memoir 53, 

 pp. II, 18, 21, 47. 



