14 



granite boulder which is uncovered to the extent of about 2 ft. 

 It is not unlikely that this bank of drift has slipped down from 

 higher ground. 



A few hundred yards further north, at a point nearly opposite 

 the gates of Beaudesert, occupied by Mrs. Hutchnison, two large 

 granite boulders are seen on the right hand side of the road, near 

 the crest of the foot hills. They are at an elevation of about 80 

 ft. above the road, and as they exhibit flat faces toward each 

 other, it is very likely that they originally formed one block 

 which has split along a line of weakness into two. They are now 

 3 ft. apart (one having slid a little down the bank), and are about 

 of equal size, measuring, respectively, 7 ft. x 3 ft. above ground. 



Miss Hutchinson, of Beaudesert, kindly directed my attention 

 to a very fine erratic which occupies the bed of a dry tributary 

 of the river about a quarter of a mile below the farmstead. It 

 is a solid block of granite, 6 ft. x 5 ft. x 3 ft. 6 ins. high, and 

 has a fragment lying beside it which appears to have at one time 

 formed part of the larger mass. The boulder rests on a whitish 

 sandstone, somewhat flaggy in structure, which is set irregularly 

 with erratics of all sizes. This glacial sandstone is well seen 

 about ten yards further down the creek, where it occupies the 

 whole bed of the stream and has a dip of 18° N.N.E. Between 

 this spot and the Beaudesert farmhouse there is a bed of 

 laminated black clay in the bottom of the Hindmarsh River 

 which has much the appearance of the black shale of the Inman 

 Valley, where it is found to be intercalated with the glacial sand- 

 stone. 



Half a mile further north the glacial sandstones are said to be 

 again exposed in the bed of the river at the confluence of a 

 tributary, and the retaining wall of the Mount Billy bridge, 

 which crosses the stream in Section 138, Hundred of Goolwa, 

 rests upon the same beds. Large granite boulders, I was told, occur 

 on the top of the foothills to the right of the Mount Billy bridge, 

 but I had not the opportunity of visiting them. 



On Mr. Abel Gray's property, at Condolley Farm, Section 59, 

 Hundred of Encounter Bay, there is an exposure of glacial sand- 

 stone which forms a cliff 15 feet high. The beds have a dip 

 12° S., 3° E. The stone is moderately hard, and Mr. Gray when 

 building his house put in two shots to test the quality of the 

 stone for building purposes, but it proved too friable for use. 

 The beds at this place are comparatively free from large stones, 

 but several small granite boulders were seen on the surface which 

 had probably been weathered out from the upper beds, the largest 

 of which measured 18 inches in length. 



Mr. Gray informed me that the same sandstone could be seen in 

 the creek on the other side of the Green Hill opposite his house, 



