124 RESEARCH COMMITTEES. 
is seen on the eastern side of the road only ; is 33 yards long, 
12 ft. high, with base not exposed. The clay carries erratics 
showing glaciation, which, though numerous are small, the largest 
one noticed was a greenish quartzite, 12 in. x 6 in. striated. 
Estimated height above sea-level, 500 ft. 
CAPE JERVIS. 
Selwyn, in his report already quoted, mentioned the occurrence 
of granitic boulders in the fields at the Cape, which he thought 
must have come from Kangaroo Island, but he failed to recognise 
their significance in conjunction with the Till which has an 
important local development. His observations, however, made 
us the more anxious to see the locality, and we were rewarded in 
finding the most extensive deposits of a genuine Till yet discovered 
in South Australia. 
The bed-rock consists of dark-coloured arenaceous shales and 
schistose rocks, which, in outcrop, are much decomposed and 
crumbling. They have a strike north and south, and an easterly 
dip averaging about 45°. Their serrated edges occupy the beach 
and in places rise a few feet above high-water mark. 
Hills of morainic material, over 100 feet high, rise crescent- 
shape behind the light-house and follow the nor thern trend of the 
coast in a steep cliff face. 
Large erratics occur in the light-house yard and can also be 
seen. singly or in groups scattered over the sides of the hills as 
viewed from the light-house buildings. In one granitic group I 
counted thirty close together, partially weathered from the Till 
in which they were imbedded. ‘The largest had an exposed face 
of 5 feet. Near to these was a large block of grey quartzite stand- 
ing is inches out of the ground, and strongly glaciated. <A short 
distance away from this group was a large rounded boulder of 
granite measuring 3 ft. 3 in., much weathered, and close by it a 
large bluish-coloured quartzite with a mass of 7 ft. 6 in. x 3 ft. 
9 in. exposed above the Till. 
On the beach, north of the light-house, and near the commence- 
ment of the high cliffs of Till, three large erratics occur close 
together. (1) Granite, 4 ft. 6 in. x 2 ft. x 2 ft. 4 in., having a 
flat fractured face extending over entire width of stone; (2) 
granite, 5 ft. 3 in. x 2 ft. 6 in. also shows large fractured face ; 
(3) quartzite, 4 ft. 3 in. x 2 ft. 6 in. x 2 ii, 10) s00, 
The Till is unstratified and very characteristic. It varies in 
colour from grey to almost black, and is full of boulders of all 
sizes. About half a mile along the north beach from the light- 
house a large granite boulder is seen fixed in Till on face of cliff, 
4ft.x 5 ft. It is of coarse texture, and includes large rounded 
crystals of orthoclase similar to the Port Victor granite. Not 
much time could be devoted to the smaller erratics, but the occur- 
