310 T ransaction!^. 



highest peak is 5,750 ft., and the mean of twenty peaks is 4,800 ft. In 

 structure the Lyell peneplain resembles the Mount Arthur peneplain, the 

 ancient sediments, and in part also Cainozoic rocks resting on a platform 

 of granite. Thus on the west the peneplain is edged by the granites of 

 Mount Radiant and Moimt Glasgow, and granites occur on the south and 

 east.* The strike of the older sediments is nearly north and south. f 



The Murchison peneplain is separated from the Lyell peneplain by the 

 Motueka fault. It is determined on the west by the Tutaki fault, on the 

 south-east by the alpine overthrust, and on the east by the Sherry fault. 

 The highest peak is 4,629 ft., and the mean of eight peaks is 4,000 ft. This 

 block is low on the east, due to denudation and to the overriding of the 

 alpine peneplain. It has been very thoroughly dissected, so that only on 

 the west do sediments which strike north and south occur. J To the east 

 the granite has been cut out into isolated pyramids. 



The Victoria peneplain, the remnants of other domes, is bounded by 

 the alpine -overthrust and Matiri faults. The Matiri fault traverses its 

 northern end, and roughly separates the Brunner and Victoria Ranges. 

 The highest peak is 5,571ft., and the mean of twenty peaks is 4,930 ft. 

 Denudation has removed nearly all the sediments first uplifted by the 

 iaccolites. A strip of slate with a north-and-south strike § borders its 

 western flank. Patches of Cainozoic rocks occur on the west and north- 

 east. 



The Wainihinihi peneplain! 1 flanks the alpine divide as far north as Bell 

 Hill. The alpine overthrust separates it from the alpine peneplain, and 

 on the west it is determined by the Ross fault. This peneplain, which has 

 a north-east and south-west extension, has been very thoroughly dissected 

 bv rivers flowing across it from the alpine peneplain. It now consists of a 

 series of pyramidal peaks with an average height of, say, 4,000 ft. The 

 sediments which formed part of its original mass occur only as narrow 

 strips flanking the Avest of the peaks from Bell Hill to Ross, and striking 

 north-north-east to north-west. "^j 



The Paparoa peneplain is a truncated dome the sediments of Avhich 

 flanked it before peneplanation ; elevation and faulting are now repre- 

 sented by the slates at its northern and southern extremities, which strike 

 from north-west to north-east.** It is bounded by the Mawhera and Lower 

 Bulier faults. Its highest peak is 4,250 ft., and the mean of five peaks is 

 4,000 ft. This peneplain is almost entirely surrounded by Cainozoic rocks 

 derived from its own degradation. tf 



The alpine peneplain is of the same age as the other peneplains of the 

 area. It stretches without break from D'Urville Island to Otago. 



The wonderfully well-preserved groups of block mountains occupying 

 -Central and North Otago, first described by Professor Park,JJ are the 



* Haast : Geol. Explor. of W. Nelson, pp. 98, 99. Mackay : Geol. S.W. Nelson, 

 p. ()(>. Webb : Geol. Surv., 2nd Ann. Rep., pp. 26, 27. 



t Park : Geol. Surv., No. 19, pp. 81, 82. Webb : Loc. cit., p. 27. 

 X Park : Loc. cit., pp. 81, 82. 



§ Haaxt : Geol. Explor. of W. Nelson, p. 101. Mackay : (leol. Sur\-., No. lo, p. 12:1 

 ■ et ■<eq. 



II Bell: N.Z. Geol. Surv. Bull. No. I (n.s.), p. 2(). 

 ^ Bell : Loc. cit., p. 4(). Morgan : Ibid., No. (i (n.s.), p. 97. 

 ** Cox : Geol. Surv., No. 9, p. 70. 

 tt Mackay : Map with Geologv of S.W. Nelson. 



+JPark: N.Z. Geol. Surv. Bull. Nos. 2 and 5 (n.s.), 190ti, 1908; and ''Geology of 

 New Zealand,^' 1910, pp. 10, 11, 144. 



