Bd. III: 2) CONTRIBUTIONS TO TUE GEOLOGY OF THE FALKLAND ISLANDS. 
23 
On the slope of Stephens Peak, a conical sandstone hill situated on the SW. 
side of Port Stephens, I found a recent mud-stream extending almost from the top 
of the mountain to its base, with a breadth of 32 metres where it was widest. The 
fall of the stream was ii — 19k Its material was a kind of stony clay charged with 
big blocks, the whole having much I'esemblance to some types of the glacial till. 
Also on the surface of the stream there lay numerous blocks, the largest having a 
diameter of 1.5 metres. I removed several of these big blocks to examine their 
bedding, and I always found them to rest upon the stony mud, never upon a base- 
ment of other blocks or solid rock. ^ 
Fig. 9. Recent solißuction on the slope of Stephens Peak. 
In other parts of the same slope I found ancient mud-streams which were bor- 
dered by vegetation and evidently fixed at the present time. In some places the 
fine material was washed away by surface water, only to leave a residuum of sand- 
stone blocks, a copy in miniature of the large stone-runs. Between the latter and 
the recent mud-streams of Bear Island my observations on the slopes of Stephens 
Peak gave all the transitional stages. It is quite evident that the large stone-rivers 
once formed masses of flowing soil, which are now fixed, washed by surface-water 
and partly grown over by vegetation. The time of the formation of these large 
sheet-floods of moving waste must have been much more favourable to solifluction 
' Flowing slopes of exactly the same type as those on Stephens Peak I found also on West Head 
o the SW. side of Fox Bay (fig. lo). 
