H(i. HI; 2) CONTRIBUTIONS I’O THE GEOI.OGV OF THE FAUCEAND ISFANUS. 33 
It has been said above that the creeks are continued landward by small river- 
valleys. Fig. 16 a gives a transverse section of such a valley, showing its gentle 
slopes and the streamlet on its bottom. Fig. 16 b is a section of the creek forming 
the seaward continuation of this same valley. Here the bottom is covered by 
marine sediment and the slope is broken by a low cliff formed by the tidal current 
that runs with considerable force in and out the creek. The surfaces of these cliffs, 
which are affected only by weathering and tidal waters, never by waves that cannot 
rise in the narrow creeks, sometimes offer a very peculiar honey-combed surface, as 
proved by the specimens figured on Plate 7 and originating from Port Darwin and 
from Camilla creek, a branch of Brenton Loch. 
Fig. 16. Transverse sections of siipra?narine (a) and submarine (b) farts of a river-valley. 
Ill some places there may be seen in the supramarine valleys old, mostly obli- 
terated cliffs originating from the time when the islands were submerged beneath 
their present level. 
The first indication of submergence I noticed on the south side of Mount Low, 
a quartzite-mountain, 268 m. in height and situated between Berkeley Sound and 
Port William. The southern slope of this mountain is partly covered with a stone- 
river-mass of the characteristic appearance that we know from the Darwin-stoneriver; 
a light-grey blockfield traversed by plant-covered strips. When the mountain is viewed 
from the south, for instance from Port William, there is seen a horizontal terrace- 
line cutting straight across the stoneriver-field and giving the appearance of a raised 
beach originating from a time of submergence much later than the formation of 
the stone-rivers. 
On mounting the slope I found the terrace, when seen close, to be difficult 
to distinguish and much grown over. Its altitude was measured to be 89 m. 
above sea-level. 
Schwedische Südfolar-Expedition igoi — içoy. 5 
