Adkin. — Former Glaciation in the Tararua Uanges. 



313 



The main cirque at the head of the valley has a diameter of nearly half 

 a mile. The precipices forming the bounding walls of the cirque attained 

 a maximum height of 800 ft. above its floor. Below the cirque the valley 

 is U-shaped for about two miles, the sheer lateral walls having a height 

 of upwards of 400 ft. The U shape of the valley is less pronounced towards 

 its lower end, and two miles below the cirque the latter narrows, gradu- 

 ally becomes V-shaped, and finally gorged. The continuity of the bounding 

 precipices of the main cirque — which are best preserved on the south-west 

 face of Arete Peak — is broken by the three U-shaped glacial hanging valleys. 

 The largest of these lies on the south side of Arete Peak, and rises in a 



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Diagrammatic Sections of the Glaciated Portion of Pa^k Valley. 



(1.) Cross-section and diagram of main cirque. (2.) Enlarged view of cirque, 

 showing glacial hanging valleys. (3.) Longitudinal section and diagram of 

 left wall of valley. 



4000 



3 



rather poorly developed cirque. It has a length of about 15 chains. The 

 other two lie between Arete Peak and Mount Dora, and rise in ill-defined 

 cirques. They are twin valleys, being separated only by a low rounded 

 ridge. Their length is about 6 chains and 8 chains respectively. A small 

 narrow gorge has been cut in the lip of each of these glacial hanging valleys 

 by the streams which now drain them. 



