170 STEVENSON— INTERRELATIONS OF THE FOSSIL FUELS. 



coals. Both are described as lignite but the composition of the 

 lower bench, dull coal, suggests that it is of Lebertorf origin. Coal 

 from a bed on Kachemak Bay is of the same type, as it has 71.3 

 per cent, of volatile. 



Upper part. 

 Lower part. 



Water. 



11.26 

 10.58 



Volatile. 



Fixed Carbon. 



40.51 

 66.21 



41.24 

 15.26 



6.99 

 7-95 



Eldridge,-^^ during examination of a district in eastern Alaska, 

 discovered 10 to 15 deposits of low-grade lignite, 6 inches to 6 feet 

 thick. The material resembles a mass of compressed carbonized wood. 

 Stumps, one to two feet in diameter, are common and stand erect. 

 These, by their appearance and by their association with abundance 

 of slivers and other carbonized material, suggest that the coal beds 

 originated in swamp vegetation. Occasionally, the coal shows no 

 woody structure and resembles the higher grades of lignite, which 

 shade off into bituminous coal. 



Collier, not long afterwards, examined beds along the upper 

 Yukon River, where the coal is either lignite or lignitic, little dis- 

 turbed and usually contains amber. He visited a locality in the 

 province of Yukon, Canada, 20 miles from Dawson and 7 from the 

 Klondike, where R. G. McConnell had seen a double bed with 5 to 6 

 feet of coal^ hard, without woody fiber and of practically the same 

 composition in both benches. At 20 miles below Dawson, he saw 

 3 beds mined, all with one or more partings and all showing 

 abundance of resin. At Washington Creek, 80 miles below the inter- 

 national boundary, he found a bed measuring clean coal, with thin 

 partings, 5 feet 6 inches ; dirty coal, 2 feet 6 inches ; sandstone, 2 

 feet ; shale, 2 inches ; coal, 2 feet. The dip is 45 degrees, but there is 

 neither crushing nor faulting. The coal is black, glossy and has 

 conchoidal fracture, but it often shows woody structure and it con- 

 tains streaks as well as grains of resin. The coal beds, seen by Col- 



235 G. H. Eldridge, "Reconnaissance of the Sushitna and Adjacent Ter- 

 ritory, Alaska," Twentieth Ann. Rep. U. S. Geol. Survey, 1900, Ft. VII., 

 pp. 21-23. 



