114 RESEARCH COMMITTEES. 
No. 5.—ON THE EVIDENCE OF GLACIAL ACTION IN 
THE PORT VICTOR AND INMAN VALLEY DIS- 
TRICTS, SOUTH AUSTRALIA. 
Fourth Report of the Preceding Committee. 
EVIDENCES OF GLACIATION IN THE INMAN VALLEY, YANKALILLA, 
AND CAPE JERVIS DISTRICTS. 
Physical Features. 
THE localities referred to in the present notes are comprised 
within the peninsula which forms the southern limits of the 
Mount Lofty Ranges. The area is roughly triangular in outline, 
with Port Victor and Normanville at the base and Cape Jervis 
at the apex, and is bounded on the sea line by Encounter Bay. 
Backstairs Passage, and the south-eastern portions of the Gulf 
St. Vincent. 
Between Port Victor and Normanville there is a stretch of rela- 
tively low land broken up into minor hills and valleys, bounded on 
the north and south by ranges of greater magnitude. This main 
valley is divided transversely by the Bald Hills, which cross the 
valley at two-thirds distance between Port Victor and Norman- 
ville, and forms a water-parting between the seas on either side. 
The Inman River takes its rise on the Bald Hills Watershed, 
about 15 miles west of Port Victor, and empties its waters into 
Encounter Bay. With its tributary, the Back Valley Creek, it 
drains an area of about 50 square miles. The flats bordering the 
river are of small extent, and the valley is occupied by undulating 
hills that rise 200 feet or more above the level of the stream. 
The Bungala River takes its rise on the western flanks of the 
Bald Hills, and after passing through the township of Yankalilla 
finds its outlet in the Gulf St. Vincent at Normanville, making a 
course of 6 miles in length. 
The main valley, including the country on both sides of the 
Bald Hills Watershed, gives a length of 22 miles by road, and a 
superficial area of a little over 100 square miles. The secondary 
ranges of the valley, consisting mainly of newer deposits, do not 
attain a height above sea level much exceeding 600 feet, whilst 
the average elevation of the enclosing primary rocks is from 
800 feet to 1,000 feet. The highlands which define the northern 
and southern boundaries of the main valley consist of schistose 
and other metamorphic rocks, and, as measured on the map, are 
6 miles apart at the lower end of the valley (where the valley is 
widest), but they converge on the western side, in the Hundred 
of Yankalilla, and at two points the valley is narrowed to about 
2 miles in diameter. 
