668 GEOLOGICAL NOTES ON KOSCIUSKO. 



slowly converted into V-shaped valleys; the v-shaped notch in 

 the hard gneiss below Lake Andrews having required a period of 

 time of probably from 50,000 to 100,000 years for its erosion. 

 As stated in our previous paper, the amount of erosion that has 

 taken place since the last and youngest of the Kosciusko glaciers 

 disappeared may be estimated at from perhaps 10,000 to 20,000 

 years. 



It may be suggested that in view of the above facts we may 

 conclude that the snow-line at Kosciusko during the maximum 

 glaciation was fully 300 feet below the present limit. This would 

 involve a lowering of the mean temperature by about 10° Fah. 



There is now great need for a more detailed examination of 

 the glacial phenomena at Kosciusko as well as on the adjoining 

 plateau to the south-east, above the right bank of the Thredbo. 

 It is also very desirable that careful examination be made of the 

 Snowy Valley above and below Jindabyne down towards Delegate, 

 and of all the country between Jindabyne and Kiandra where 

 there are traces now of small lakes or tarns. 



The suggestion, too, may be made that the Dargo high plains 

 of Victoria, including the high plateau of the Fainter, may be 

 carefully examined. Mr. E. C. Andrews has recently explored 

 the Bogong Eange proper and found that it is more of the nature 

 of a high ridge unsuited for forming the gathering ground of an 

 ice-sheet of considerable dimensions. The plateau of the Fainter, 

 however, is of far greater extent, and would probably have carried 

 glaciers during the maximum glaciation of Mount Kosciusko. It 

 will thus be seen that these recent observations tend to greatly 

 increase scientific interest in the Alpine region of Australia. 



EXPLANATION OF PLATE xxiii. 



View of the Valley of the Murray, from Lake Albina. (From a photograph 

 taken, and kindly lent, by Judge Docker). 



