Dec., 1918] 



The Great Hot Mud Flow 



121 



ered into the most fantastic blocks, like the hoodoos of the 

 bad land region, (see pages 118 and 120). 



The bulk of it is composed of very fine dust-like particles, 

 closely packed together until they form a compact, homogeneous 

 mass. But in this mass are included numerous lumps of pumice 

 and fragments of rock of all sizes, sometimes in large quantities, 

 but always without any trace of sorting or stratification, 

 except where the material was obviously subject to secondary 

 readjustments. 



Photograph by C. F. Maynard 

 LOOKING TOWARD KATMAI PASS FROM BAKED MOUNTAIN. 



The high mud mark sloping down into the Valley on each side of the mud 

 flow is very evident. 



VALLEY SURROUNDED BY A CONSPICUOUS 

 ''HIGH WATER MARK." 



The "high water mark," separating the chocolate tuff- 

 covered basin of the Valley from the gray ash slopes of the 

 mountains before alluded to, impresses one more and more 

 as he studies the phenomenon. It follows, in a general way, a 

 contour line 200 to 360 feet above the floor of the Valley. While 

 it thus reminds one of the shore line of a pond, it is obviously 



