94 
The N.Z. Journal of Science and Technology. [April 
are to be seen in many places, frequently at high levels, and also the 
remains of the fans of streams whose lower surfaces repose on the modified 
floor of the old basin. As the post-glacial streams incised their channels 
they also left remnants of terraces far above the present water-level, some 
of which are remarkably accordant with each other. The present character 
of the drainage points to recent rejuvenation, which is evidently in sympathy 
with that exhibited by the main rivers of the province as they issue from 
the mountain region. 
Fig. 1.—Map of Broken Riverpiistrict. 
• 
The most important physiographical feature of the Broken River coal 
area is the river which gives it its name. This runs in a general west-to- 
east direction along the northern flank of the Torlesse Range to join the 
Waimakariri just above its gorge. The bed is deeply incised, and its banks 
rise steeply almost everywhere to heights of from 200 ft. to 500 ft. above 
water-level. The breadth of the flood-plain is usually narrow, little more 
than the breadth of the stream itself, and it only widens out where the 
