146 
The N.Z. Journal of Science and Technology. . [May 
valley form is illustrated in fig. 2, which represents a portion of the valley of 
the River Awatere, in Marlborough. It will be noted that the lines traced 
by the terrace-fronts are convex, and also that occasionally two terrace-fronts 
Fig. 3. —Part of the Waipara Valley, Canterbury, showing, in the centre, a flight 
of terraces. 
merge into one, where a part of one terrace has been cut away during the 
development of the next lower temporary floor. Some of the temporary 
floors may thus have been entirely destroyed. Fig. 3 shows a flight of 
similar terraces in the valley of the Waipara River, in Canterbury. 
Valley-plain Terraces .—In the case of the Awatere Valley and other 
areas of valley - in - valley or composite topography valley - plains of 
the earlier cycles, or remnants of them, form well-marked terraces. 
Fig. 4. —Valley-plain terrace bordering the Kekerangu River. 
They record the occurrence of periods of stillstand of much longer 
duration than those previously referred to—of sufficient duration to 
rank as cycles; and it is sometimes possible to correlate one remnant 
with others in the same or even in adjacent valleys, and so to re¬ 
construct in imagination the surface of which it once formed a part. 
