201 
part of the beach may be accounted for by the slight amount of 
denudation to which the clay has been subjected at this point. I 
regret that I had not time to re-examine this ground on my 
return journey. 
Bay of Shoals.—After rounding the Bluff in the Bay of Shoals 
the cliffs become low and uniform, composed of a reddish clay 
covered with travertine. A range of low hills runs parallel with 
the coast at half a mile distance, and, from appearances, are 
capped with travertine limestone. The north side of the Bay is 
destitute of cliffs, the shore line being composed of sand inter- 
mixed with patches of travertine that rises gently from the water- 
level. No distinct evidences of glacial action were observed 
within the limits of the Bay of Shoals. 
Salt Lagoon.—The first indisputable proofs of glacial action 
were met with some distance inland from the head of the Bay of 
Shoals. Deviating from the coast at Salt Creek, I went three 
miles in a south-west direction, and visited Salt Lagoon in Section 
63, Hundred of Menzies. The Lagoon (which must be dis- 
tinguished from a larger “Salt Lagoon,” situated about two 
miles to the north-east) is a sunken area, not quite half a mile in 
length, and in summer is dry and incrusted with salt. 
On the western side of the Lagoon, in clay ground, I found 
numerous travelled stones, some of large size. Sixteen good- 
sized granite boulders, besides numerous quartzites, were counted 
within a short distance of the lake. The eastern and southern 
boundaries of the lake consist of travertine ridges, but on the top 
of the rise on the south side there is a conspicuous dark-coloured 
and very siliceous quartzite boulder, which has been much flaked, 
whether by human agency or not is difficult to say. The boulder 
clay at this point has a trend northwards, following the base of 
Rettie’s Bluff, a very prominent basaltic escarpment of the Gap 
Hills. 
Returning to the Bay of Shoals, the northern shores were 
followed to Point Marsden. In this locality the geological 
features are entirely obscured by sand and travertine, and little 
of interest was met with till Point Marsden was reached, at the 
extremity of the north-west peninsula of Kangaroo Island. 
Point Marsden to Smith’s Bay.—Near the Point a very remark- 
able sandstone (to be referred to presently), occupies the coast 
line, and continues for many miles in a westerly direction, 
making travelling by the beach difficult and wearying. A few 
erratics can be seen lodged between the serrated outcrops of the 
sandstone near Point Marsden, but are much more numerous a 
little further to the west. 
The cliffs along this part of the coast, whilst attaining a con- 
siderable altitude, are very disappointing, being capped with 
Oo 
