Trans. N.Z. Inst., Vol. XL IX. 



Plate XXII. 



Fig. 1. — View of Porter River, showing two beds of limestone with interstratified tuff. 

 The angle of the river is just at the point of inflow of Home Creek. 



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^v ^W 



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n»._ 







m*^' 



^-> B ««^ 1. - _ A 



Fig. 2. — Great fall of limestone rocks at lower gorge of Porter River. The small debris 

 slope on the middle, as well as the surface of the large block above it, is full of 

 shells. The shell bed as it lies in position is near the top of an inaccessible 

 cliff to the right. The tuff beds underlying the upper limestone are to be seen 

 on the left side of the picture, just across the stream, and the limestone appears 

 in position above them. 



