254 
by the fault. In the southern half the succession in descending 
order is: 
Alternating beds of white quartzite and black hornfels; about 200 meters; 
Granite ; 
whilst the following succession was noted for the southern half 
during a cursory examination (the thicknesses have not been 
measured, but only estimated): 
White quartzite, about 60 meters; 
Black hornfels with subordinate quartzite beds, about 40 meters; 
White quartzite and black hornfels, about 100 meters; 
White quartzite with subordinate dark beds, about 200 meters; 
White sandstone, about 100 meters; 
Red sandstone, about 200 meters; 
Granite. 
This last section is of itself interesting as showing a gradual 
transition from the relatively unaltered red sandstone at the south- 
ern side of the foot of the mountain to the greatly metamor- 
phosed strata in the crest which is quite close to the contact, 
and probably was at one time covered by augite-syenite. If the 
quartzite in the northern half of the Iganek Mountain (Fig. 21) 
had been lying in its original position in relation to the granite 
on which it now lies, it should correspond to the red sand- 
stone in the southern part of the mountain, and the numerous 
thick hornfels beds in the quartzite north of the fault should 
be represented south of it by slate beds and diabase sheets 
wedged into the red sandstone. But this sandstone at the south- 
ern side of the foot of the Iganek Mountain, as far as has been 
observed, is very poor in diabase and shale. On the other hand 
there is a striking likeness between the strata directly covering 
the granite north of the fault and those south of it which lie 
several hundred meters above the granite. Consequently it does 
not seem unlikely that the sandstone mass delineated on Fig. 21 
is only an isolated large fragment of sandstone which has gained 
its present position in relation to the granite through the dis- 
turbances which accompanied the intrusion of the abyssal rocks. 
