C. A. Cotton — Block Mountains in New Zealand. 277 



The Manuherikia, Ida Yallej, and Maniototo depressions are 

 practically continuous towards the north, being separated only 

 by gently upwarped areas in which the undermass rises suffi- 

 ciently high to be stripped of its cover. The Maniototo 

 depression is separated from the Strath Taieri, however, by a 

 considerable area in which the covering strata, now maturely 

 dissected, have survived as uplands owing to the presence of 

 basalt. 



The Northern Highland of Otago. — The northern boundary 

 of the chain of depressions described above is formed by a 



Fig. 17. 







Fig. 17. Bird's-eye view of the slightly dissected stripped surface of a 

 gently tilted, narrow fault block descending northwestward (toward the 

 camera) and meeting alow fault scarp, the crest of which is seen in the fore- 

 ground. Note that the dissection is entirely consequent and insequent. 

 The point of view is a small lava-capped butte of rounded form, a remnant 

 of a former more continuous cover. 



series of scarps with a predominant northwesterly trend. 

 Beginning at the western side, the northeastern end of the 

 Dunstan block is a narrow, northwest-trending fault-angle 

 depression occupied by Dunstan Creek separating the Dunstan 

 block from the St. Bathans Eange. The St. Bathans block 

 merges at its southeastern end into the Manuherikia depres- 

 sion. It is elongated in a northwesterly direction and to the 

 northwest merges into the highland region. It presents a 

 fault scarp to Dunstan Creek and is strongly tilted to the 

 northeast, the back slope descending in that direction to a 

 fault-angle depression forming a northern prolongation of the 

 Manuherikia depression, which is bounded on the opposite side 

 by a long, straight, and conspicuous fault scarp, that of the 



