GLACIAL COMMITTEE. 195 
With respect to the newer of these glacial formations— 
probably of Permo-Carboniferous age—its extent has already 
been indicated as occupying a great part of Cape Jervis 
Peninsula, south of the Sellicks Hill and Hindmarsh Ranges, 
the northern portion of Kangaroo Island, and the southern 
portions of Gulf St. Vincent, as far north as Hallett’s Cove. 
We have, now to report that these glacial deposits cover 
almost the whole of southern Yorke Peninsula, with an un- 
known extension in a northerly direction. No Cainozoic 
(a) has been recorded from South Australia. The Permo- 
Carboniferous (B) glaciation is well represented, and also the 
Cambrian (?) (c). . 
(B.) Permo-Carboniferous, Southern Yorke Peninsula.* 
The, geology of southern Yorke Peninsula includes some 
very singular features. The country is gently undulating, 
1eaching its maximum elevation in the Warooka ridge, which 
may be about 200 feet above sea-level. The recent deposits 
consist of blown sand, travertine limestone (as a superficial 
crust), rearranged clays probably of newer Tertiary age, 
and deposits of gypsum and salt in areas of depression. 
Scattered over the district, in widely separated localities, 
numerous outliers of Eocene limestone occur. At Corney 
Point, forming the north-west angle of the coast-line, a very 
small patch of this limestone rests directly on the older 
(metamorphic) rocks, but as a rule the Eocene beds are 
superimposed on the denuded surface of a tenacious clay 
(glacial), which forms the principal geological formation of 
the district. 
The older rocks, consisting of highly crystalline schists, 
gneiss, pegmatite, and occasional granite veins, form the 
leading headlands of the west and south-west coasts, but 
in each case the outcrop is of limited extent, and does not 
rise more than 15 or 20 feet above sea-level. 
The chief feature of the physiography of the country is 
the great number of approximately circular lagoons, or salt- 
pans, 200 of them being indicated on the official survey- 
maps of one inch to the mile. These lagoons are sunken 
areas, from about 10 to 40 feet below the normal level; and 
as there is no drainage from the land to the sea within this 
area of about 800 square miles, all the rain that falls gravi- 
tates towards these saucer-shaped depressions, in conse 
quence of which they have become intensely salt by a pro- 
cess of evaporation and precipitation. 
* Ref. Trans. Royal Society, $.A.. 1900, Vol. xxiv., p. 71. 
