June, 1920] 



The Great Mageik Landslide 



339 



two miles, reaching an altitude of about 500 feet; and the 

 narrow terminal tongue a mile long but hardly 100 yards wide, 

 coming down just below the 400 foot contour. 



The upper portion, just below the cliff, has somewhat the 

 character of an ordinary talus slope. But its bowlders are of 

 a very great size, many of them 30 to 40 feet in diameter and 

 its general contours are concave in sharp contrast with the 

 ordinary cone of talus. Along with the large size of its bowlders 

 goes a certain roughness and irregularity of surface not found 

 in the typical talus. 



Photograph by Robert F. Griggs 



THE CLIFF FROM WHICH THE SLIDE ORIGINATED. 



The steep slope of its upper course contrasts with the low gradient of the flat 



valley covered by the lower section. The Slide has been 



darkened to make its outlines more evident. 



The irregularities of the upper surface perhaps foresh9,dow 

 the conical mounds that appear so plentifully in the middle 

 section, but there are no such features on the steep portion 

 of the slope. 



In the second portion that occupies the fiat valley above the 

 bend are the largest and most perfectly developed cones. Here, 

 also, is a much higher percentage of large rocks and less soft 

 stuff than the lower portion below the bend, for the cones 

 gradually become smaller and less numerous as one approaches 

 the tip, although some cones and some very large bowlders 

 •occur clear down to the end. 



