196 PROCEEDINGS OF SECTION CGC. 
The clay which forms the retentive floor of these lagoons 
is the glacial clay, already referred to, and can be studied in 
many of the cliff sections, surrounding the lakes, and the 
large erratics which may be frequently seen in the bed of 
the lakes or exposed in their banks. 
Perhaps the most interesting locality for these features is 
on the north side of Lake Fowler, the largest of these saline 
lagoons, with a circumference of more than ten miles. In 
the sioping banks of this lake, near the salt-stacks, a group 
of pink-coloured granites (probably fragments of a single 
block) can be seen, measuring six feet by ten feet. A little 
to the westward of these, two huge granite blocks are visible 
in the mud of the lake, not far from the shore, six feet high 
and eight feet wide. A little further west, two enormous 
boulders of a dark-coloured quartzite le at the base of the 
cliff ; one, slightly larger than the other, measured thirteen 
feet six inches long and five feet six inches wide. The cliffs 
at this point show irregular alternating exposures of clay 
‘and sand, with contortion lines. 
Other inland localities where large erratics were noted 
were as follows:—-Munkowurlie Lagoon, Moorowie Head 
Station, Pentonville Head Station Lagoon, a very con- 
spicuous boulder near the public road, seven miles from Corney 
Point, with an exposure above ground of seven feet by five 
feet. Warooka Hill, one of the highest points of the dis 
trict, is a ridge of glacial clay, eroded on three sides, with 
large boulders weathered out on the sides of the hill. In 
many other localities smaller erratics were recognised 
scattered over the cultivated fields, and similar evidence of 
glacial action was afforded in the material brought up from 
wells sunk in the district. 
The exposures of glacial clay in the sea-cliffs, both on the 
south and north coasts, proved to be of a very instructive 
character. At Troubridge Hill and at Port Moorowie, 
both situated on the south coast, the sea-cliffs show 
sections of the glacial clay, with large erratics on the beach, 
between tide-marks. At the first-named locality the first 
definite evidence of the glacial beds being mferior im position 
to the Hocene limestones was met with. The excavations 
carried out at Hallett’s Cove in 1894, under instructions 
from the Council of this Association, demonstrated the pre- 
Miocene age of the glacial deposits at that locality, but no 
evidence was available to indicate the time limit of the 
ice-age antecedent to the Miocene. In the section at 
Troubridge Hill, however, a bed of limestone, three feet in 
thickness, crowded with the characteristic Eocene echinus, 
