108 



PRESIDENTS ADDRESS. — SECTION C. 



Fig. 8.- 



Barewopd jPlateau 

 -(After Cotton, 1917). 



Oeologic sketch map of the block mountains associated with Central Otago chain of 

 depressions. (Boundaries after McKay, with slight modi ication.=.) The areas in which 

 schist undermass rocks reach the suiface are marked by waved noith-south lines, the 

 areas of greywacke (unaltered or little altered) by stiaiglit north-south lines, and those 

 in which the overmass forms the surface, or is thinly coveied by alluvium, by straight 

 east-west lines. Volcanic rocks of the overmass are shown in black. 



at which the latter arei generally steeply upturned. Generally th« 

 faults are oblique toi the strike of the folded strata they truncate, 

 and thus the dominantly north-easterly strike of the Mesozoic and 

 older rocks is net evidence of the direction of late Mesozoic folding. 

 Suess' conclusion cited in regard to the North Auckland Peninsula 

 that the direction of the coast line is independent of the strike of 

 the folding, is still apiplicable tO' regions where the strike of the old 

 folds and of tha "Pleistocene " faults are more nearly coinparable 

 (Cotton, 1916). Tilting of the fault-blocks is not as a rule very 

 steep, a notable exception being that of the Kaikoura Mountains 

 (Cotton, 1913). In some regions the evidence of lateral thrusting 

 is clear. In the Kaikoura Mountains, the Great Clarencei Valley 

 f'^ult mero^es northwards intO' an overturned syncline (Thomson 

 1919). Park has described in more detail (1909, 1913) the wonder- 

 ful infolding of an overturned and fault-ed syncline of Tertiary 

 rocks recosrnised by Hutton (1875) and McKay (1894) on the shores 

 of Lake Wakatipu. (See Figuret 9.) Marshall (1918) describes the 



