Geology and Mineralogy. 305 
used by Indians, who have left upon its floor a large accumulation 
of the ashes of their fires,—a pile 100 feet long by perhaps 30 feet 
wide, and two and a half feet deep,—in which I have found burie 
human bones, seeds, and many Indian relics. The water-fall, with 
its semi-circular cavern, is a hundred rods above the Ash Cave. 
e 
Rock House idor high up in the cliff, 
» proper, is a magnificent corridor high up } ’ 
formed by the action of the little stream passing down a crack 
by J. W. 
? . 
Powrit, 218 pp. 4to., with plates and sections, and also a folio 
atlas, Washington, 1876.—Major Powell, in this sequel to his 
Report on the Colorado region published in 1875, embraces, be- 
