BY T. W. EDGEWORTH DAVID. 665 



At a spot between Betts' Camp and Pretty Point, known as 

 Taylor's Bog, about a mile N.E. of the Porcupine Ridge, there is 

 a small but well-marked old moraine, 15 chains in width and 

 about 20 feet in height. The altitude of this moraine is about 

 6000 feet above sea-level. Near this locality, too, a block of 

 phyllite was observed showing obscure glacial strise. 



A re-examination of the smoothed granite surfaces at Thomp- 

 son's Flat convinced me that they were of true glacial origin, and 

 even as far down as Boggy Plains in the head of Wilkinson's 

 Valley Mr. Andrews agreed with me that there was distinct 

 evidence of glacial action, chiefly in the form of the smoothed 

 rock-surfaces and the arrangement of the morainic material. 



From the foregoing observations it may be concluded that the 

 ice-sheet during the maximum glaciation extended to at least 12 

 miles N.E. from Mount Kosciusko, and that the ice-sheet moved 

 in a general S.E. to E S. E. direction from the main dividing 

 range between the Snowy and Murray Rivers towards the valley 

 of the Thredbo. By far the greater portion of the ice-sheet, or 

 calotte, lay to the S E. of the main divide, and spread to a 

 distance of probably at least 7 miles at right angles to the former. 

 At the same time there is evidence also of small glaciers descend- 

 ing to the west of the main divide, such as those which formed 

 the glacial features of Lake Albina, of the Wilkinson Valley, 

 and of Lake Cootapatamba. 



The total area covered Dy the ice-calotte of Kosciusko during 

 the maximum glaciation was probably about from 80 to 100 

 square miles. This does not take account of the high land to the 

 south of Kosciusko on the south east side of the Thredbo River. 

 It is more than probable that this, too, during the maximum 

 glaciations harboured glaciers. 



The greater development of the ice-cap on the south-east side 

 of the main divide as compared with the portion to the north- 

 west is obviously due to the fact that the drifting of the snow on 

 the Kosciusko Plateau is controlled chiefly by the anti-trade 

 wind, which blows there during the greater part of the year from 

 the N.N.W., consequently the north-west slopes are swept more 

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