200 WALTER HOWCHIN 
thickness of 100 feet above sea level, passes under water to an 
unknown depth. The glacial deposits consist mainly of a bowlder 
clay carrying erratics of all sizes up to many tons in weight. Many 
of the included stones are powerfully glaciated. 
It was subsequently found that Hallett’s Cove glacial features 
represented only a small outlier of a glacial field of far greater 
extent. In 1897, Professor T. W. E. David and the writer visited 
the Inman Valley with a view to the rediscovery of Selwyn’s 
““olaciated rock.”? Near the seventh milepost from Victor Har- 
bor a very fine polished, grooved, and striated surface of hard 
quartzite was discovered partly bared in the banks of the Inman 
River. At the same time numerous large erratics, foreign to the 
locality, were seen either fixed in bowlder clay, or distributed along 
the hill sides adjacent to the river. The river bed was also, in 
places, thickly strewn with these erratics, some of immense size, 
washed out of the adjacent clay. 
As the result of observations, spread over a number of years, 
it is possible to gather some general ideas of the magnitude of the 
ice-flood. A sheet of morainic material, accompanied in many 
places with transported stones of large size, covers most of the 
southern portions of South Australia, east of Spencer Gulf;* includ- 
ing the southern half of Yorke Peninsula, Kangaroo Island, and 
Cape Jervis Peninsula from the Willunga ranges on the north to 
the sea on the south and the Murray plains on the east, an area 
that may be roughly estimated as too miles by 130 miles. It is 
highly probable that these deposits formerly extended much 
farther north than their present occurrences, for outliers of the 
till are found in sheltered situations along the shores of. Gulf 
St. Vincent and have been proved by borings to extend to a great 
depth below its waters. Important tectonic movements, in late 
Cainozoic times, brought these beds, in their northern extension, 
under conditions of rapid waste, which has probably led to the 
wiping out of the evidences of their occurrences in that direction. 
In one respect the South Australian Permo-Carboniferous 
glaciation possesses a distinctive feature of great interest, inas- 
Eyre Peninsula, on the west side of Spencer Gulf, has not up to the present 
been examined for the discovery of glacial evidences. 
