290 C. A. Cotton — Block Mountains in j^ew Zealand. 



the range that bounds the valley on the southeast side " (p. 

 112). There is no definite evidence that the fault is reversed. 



In other cases the beds of the cover lie practically horizon- 

 tally close to the bases of the scarps, as in the eastern scarp of 

 the Rock and Pillar block, and in the scarp of the Hawkdun 

 block (McKay, 1897, fig. 16), indicating probably normal fault- 

 ing. 



Fold scarps of small extent and not yet matnrely dissected 

 occur near the northeastern ends of the tapering*^ Raggedy- 



FiG. 26. 







iHS-SM 



ms^^m 





Fig. 26. The eastern portion of the Maniototo Plains and the scarp of the 

 Kakanui Range. 



Blackstone, Rough Ridge, and Rock and Pillar blocks on their 

 eastward-facing fronts (tig. 10), and on the northwestward- 

 facing portion of the last. 



The fault scarps of the schist blocks, especially where the 

 schist is weak, have crumbled to very gentle slopes. The 

 great scarp, nearly 1,000 feet high, forming the long, straight 

 southeastern face of the Rock and Pillar block, has an average 

 slope of 20°. 



The Scarps of Greywaclie Blocks. — The scarps of the gre}^- 

 wacke blocks along the margin of the northern highland of 

 Otago are little-dissected fault scarps forming the fronts of 

 tilted blocks, as are also the scarps of the block complex in and 

 beyond the Waitaki Yalley depression. 



Among the well-preserved scarps which form the fronts of 

 simple tilted blocks there is a decided family resemblance, and 

 they contrast strongly with the scarps of schist blocks. The 



