Page:Popular Science Monthly Volume 70.djvu/106

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102
THE POPULAR SCIENCE MONTHLY.
 

PSM V70 D106 Hanging valley grenville channel inside passage.jpg

Fig. 3. Hanging Valley in Grenville Channel, Inside Passage. Waterfall of stream draining the broad, U-shaped valley seen near water in right-hand half of picture. Photograph by Lawrence Martin.

 

feature a view up or down such a valley is not usually very extensive, being cut off by the projecting spurs around which the stream swings. The absence of this feature in those Alaskan valleys where there is a

 

PSM V70 D106 Hanging valley waterfall sara island inside passage.jpg

Fig. 4 Waterfall on the Very Face of the Rock Lip of a Hanging Valley behind Sara Island, Inside Passage. Photograph by Lawrence Martin.