354 EVIDENCES OF EXTENSIVE GLACIER ACTION AT MT. KOSCIUSKO, 



accompanying map (PI. xviii.) I shall be enabled to point out and 

 describe some of the most interesting and conspicuous features of 

 glaciation that have come under my observation. 



After crossing the Crackenback River a short distance above 

 its junction with the Snowy River the track begins to lead 

 steadily upwards till it reaches the foot of a mountain spur. 

 The ascent of this is steep in many places and the top of it about 

 4500 feet above sea-level. From here the ascent becomes again 

 more gradual, and continuing for about a mile Wilson Valley is 

 reached, and an open grassy flat shows up to the right. This may 

 safely be considered attributable to glacier action, and probably 

 a few smaller flats met with previously owe their origin to the 

 same cause. Above this flat the valley narrows considerably 

 between the steep ranges on both sides for some distance, when it 

 again widens out. Here terrace-like several boulder packings 

 cross it at intervals, through which the descending rivulet is 

 seeking its course in a sinuous line. Ascending further the 

 valley expands into a large flat that faces the eye with a distinct 

 terminal moraine, the fan-like expansions of which slope down 

 the valley. Entering the flat we stand on Boggy Plain and upon 

 an unmistakable glacier deposit, that covers with all its ramifica- 

 tions more than a square mile at an elevation of about 5200 feet 

 above the sea. Surrounded by elevated ground, and on account 

 of its raised termination towards Wilson's Valley this plain is in 

 many places very boggy, which is a characteristic feature of nearly 

 all the plains and flat valleys among these ranges, and has been 

 alluded to above. 



Proceeding onward, the evidences of ice-action become more 

 plentiful at almost every turn, and scarcely a valley is crossed 

 that does not testify to this formation. Very pronounced it 

 appears again on the flat about a quarter of a mile from Pretty 

 Point. This flat is strewn with boulders partly embedded in the 

 smaller debris of various kinds of rock and gritty soil, and ends, 

 in an easterly direction, towards the Crackenback River, with a 

 fan-like expansion down the side of its valley. 



