in the boulder clay. One, for example, situated at about 

 half-distance between the Bluff and the inlier of schists, mea- 

 sures 14 ft. by 9 ft. The thickness of the boulder clay, as 

 well as the foreign character of some of the erratics, is suffi- 

 cient evidence that the deposit is not wholly of local origin. 



Beyond the ice-cut rock-basin, just described, the schists 

 come again to the surface in the form of a rounded boss, 

 level with the general contour of the ridge, and dip under the 

 glacial drift on all sides except the east, where they have been 

 truncated by the sea and form low cliffs. Beyond this point, 

 the section, except where the line passes over a spur of the 

 old rocks, shows an unbroken extension of the moraine to 

 Glastonbury Hill, on the road to the Inman Valley, a dis- 

 tance of three miles from the Bluff. 



There is little to distinguish the general features of the 

 moraine, as seen in its various sections, except the greater 

 or less prevalence of its erratics. In Sections 7 and 8, Hun- 

 dred of Encounter Bay, close to the beach road, there is a 

 very fine example of a stony moraine, where a score or more 

 of large erratics, partially uncovered, can be seen in a bank 

 of till (plate v.). 



In Section 177, on the west side of Waitpinga Road, 

 there is a great field of large erratics. At the south angle of 

 this section a 30-ft. washout, already referred to, has exposed 

 more than a dozen of these large boulders sticking in the 

 clay faces of the washout or resting on the bottom. Groups 

 of granite boulders occur in different parts of this paddock, and 

 near the northern fence, at the bend of the Inman Valley 

 Road, where it rises to Glastonbury Hill, a long line of over 

 twenty large boulders can be seen (plate vi.). The moraine 

 can be traced up the sides of this hill, chiefly on the eastern 

 side of the road, where it merges into the Inman Valley 

 deposits. 



The sea has operated on the soft morainic material to 

 such an extent that a considerable bay has been created by 

 its encroachments, extending from the Bluff to the Port 

 Elliot headland. Within recent geological times glacial clay 

 formed the sea-cliffs throughout the greater part of this dis- 

 tance. The recent elevation of the seaboard has placed these 

 old sea-cliffs beyond the reach of the waves ; but they can be 

 readily recognized between the Hindmarsh River and Port 

 Elliot, and also between Encounter Bay and the Bluff, where 

 the road runs between the old sea-cliffs and the sea on a low 

 shelf sixty yards wide. 



This waste of the glacial till by the encroachments of the 

 sea has had the effect of strewing the beach and shallow water 



