48 GEOLOGICAL NOTES ON KOSCIUSKO, 



deeply grooved. The grooves cross the planes of foliation in the 

 granite at a wide angle, as the latter trend N.N.E. and S.S.W., 

 whereas the grooves run nearly N.W. and S.E. 



In Plate vii., the white vein of euritic granite is parallel to the 

 planes of foliation, and the plate shows that obviously the 

 grooves in the granite make a wide angle with the foliation 

 planes. If the gully be followed down to the edge of Lake 

 Merewether the grooves may still be traced on the sloping surface 

 of granite close to the lake shore, and it is obvious that they 

 dip below the surface of the water, the level of which is about 

 6,150 feet. 



In every case it is obvious that, in this vicinity, the N.W. is 

 the strike side, and the S.E. the lee side. 



If now a northerly course be followed towards the head of the 

 main valley, it will be noticed that the valley very nearly follows 

 the junction line between the slate and granite (see map, Plate iii.). 

 Slate erratics are found in places resting on glaciated surfaces of 

 granite. One of these measured 5 feet x 3 feet x 4 feet, and in 

 several cases typical perched blocks may be seen, one of which is 

 shown in the photograph exhibited, taken by one of us (Mr. 

 Pittman). 



At a quarter of a mile above the Blue Lake, a small terminal 

 moraine crosses the valley, slightly breached by the creek at its 

 west end. It is about 10 chains long and trends in a W.S.W. 

 and E.N.E. direction, and is of no great height. It obviousl}'- 

 forms one of the last embankments left by the glacier as it 

 retreated to the head of the valley. Its level is about 6430 feet. 



At about a quarter of a mile still higher up the valley on its 

 eastern side, and about 12 feet above the level of the creek, is a 

 small surface of quartzite, ground smooth and striated in two 

 directions, viz., N. 12° W. and S. 12° E. and W.N.W. and E.S.E. 



If, now, we return to Lake Merewether, it will be noticed that 

 the water flowing out of it escapes through a breach in the 

 terminal moraine, at a level of about 6,150 feet. The 

 terminal moraine extends from the outlet of the lake in a 

 direction about S. 35° W. for about 15 chains, and for about 10 



