42 GEOLOGICAL NOTES ON KOSCIUSKO, 



water course at lower levels, the creek north of this moraine 

 plunging down rapidly towards the Murray River. The lake is a 

 little under one-quarter of a mile in length by from about 3 to 5 

 chains in width. It appears to be fairly deep in places in pro- 

 portion to its size. Its surface, as measured by aneroid, is about 

 6,340 feet above the sea. The moraine stuff in the neighbourhood 

 of the lake has been much redistributed, and is partly masked by 

 a covering of recently slipped slate-rubble along its eastern shore. 

 Under these circumstances ice-scratched blocks would not be 

 expected to occur, except very sparingly, and as a matter of fact 

 none were observed by us. The moraine material hides the 

 granite surface from view for the most part up to a level of about 

 150 to 200 feet above the Lake, but from this level up to the very 

 summit of the ridge connecting Mount Townsend with the main 

 Dividing Range, the steep, and in places almost precipitous, 

 granite surface shows abundant and beautiful evidence of having 

 been intensely glaciated. Projecting corners are rasped off, and 

 more or less deeply grooved. Even sheltered recesses have not 

 escaped the abrading action of the ice, and the grooves and 

 strise are so fresh on some of them as to appear to be of quite 

 recent origin. Seven more or less extensive grooved surfaces 

 were observed by one of us in an hour's examination of this 

 western side of the valley. The positions of these are shown on 

 the plan, and their altitudes range from 6,530 feet up to 6,820 

 feet. The last level is within 30 feet of the top of the ridge, 

 separating the Lake Albina Valley from the Wilkinson Valley. 



It is quite evident from the way in which the rocks have been 

 ground down on the summit of the ridge that ice of considerable 

 thickness must at one time have passed over it. 



The finest grooved pavement observed by us is situated at a 

 point bearing due west of the south end of Lake Albina, and 15 

 chains distant. 



There is a smaller grooved pavement about 10 feet below the 

 larger pavement. The larger one measures about 28 yards from 

 N. to S., and about 25 yards from E. to W. The surface has 

 been ground down to a nearly uniform level, is nearly horizontal 



