138 Transactions. 



inclination in that direction appears to be parallel to that of the Baring 

 Head platform below them. 



None of these platforms can be traced with certainty beyond the 

 Orongorongo River and around Cape Turakirae, which forms the end of 

 a narrow mountain-ridge, but the profile of the ridge is smooth towards 

 the end, and there is a faint suggestion of a bench rounded and lowered 

 at the margin by erosion, the rear of which is at a height of about 

 1,200 ft. This may perhaps be the continuation of the Orongorongo plat- 

 form (Plate XXX, fig. 1). 



Westward also the continuation of these higher platforms is doubtful, 

 but the Orongorongo bench may perhaps be correctly correlated with a 

 platform of considerable extent forming the crests of the ridge and spurs 

 between the Wainui-o-mata valley and the lake (Koangatera) at the mouth 

 of the Gollan's Valley stream. This platform, which may be named the 

 'Wainui platform," is submaturely dissected, and is 500 ft. high at its 

 rear on the ridge west of the Wainui-o-mata valley. It slopes southward 

 (towards the sea) fairly steeply, but not so steeply that its slope in that 

 direction cannot be explained as probably original. 



The points at which the observations of the height of the rear of the 

 Orongorongo platform as 900 ft. and of the Wainui platform as 500 ft. 

 were made are two and a half miles apart, in a north-westerly direction, 

 and thus, on the assumption that these two may be correlated, the tilt 

 indicated is the same as that of the Baring Head platform. 



Farther to the west the Wainui platform, still descending, is cut through 

 by Gollan's Valley, on the eastern side of which the height of the rear of the 

 platform is 340 ft. and on the western side only 180 ft. Here (between 

 the lakes Koangatera and Koangapiripiri) the platform is half a mile wide 

 and very distinct, though submaturely dissected. It is not shown on the 

 published contoured map of the district, which at this point is not quite 

 accurate. There is no trace of this platform, or of any others, farther on 

 around or beyond Pencarrow Head. 



Besides these remnants of uplifted and tilted coastal plains there is 

 eastward of Baring Head a less strongly uplifted strip of recently emerged 

 sea-bottom, which extends round Cape Turakirae (fig. 2, and Plate XXX, 

 fig. 1) and along the western shore of Palliser Bay (Aston, 1912). It will be 

 referred to as the '' Turakirae coastal plain." The greater part of this coastal 

 plain, though its seaward slope is very steep (about 1 in 10), is not yet cliffed 

 at the margin. Strangely enough, it was not found to be tilted to the west- 

 ward, as the higher benches are. The absence of evidence of tilting, and the 

 difficulty which this raises as to the non-continuation of a feature indicating 

 such recent uplift along the coast westward of Baring Head, necessitate 

 the introduction of a brief description of the Turakirae coastal plain ; but, 

 since this would make too long a digression at the present stage of the 

 presentation of the evidence of tilting, it is placed in an appendix. 



Evidence Jrom Drowned Valleys. 



The tilting of the block east of Port Nicholson on a hinge-line, which 

 may be assumed in explanation of the tilted uplifted platforms described 

 above, involves partial or complete submergence of its north-western edge, 

 and this is found not only in the drowning of the central part of the Port 

 Nicholson depression to form Port Nicholson itself, but also, nearer at 

 hand, in the drowned mouths of two small valleys opening between Pen- 

 carrow Head and Baring Head. As the shore-line is followed westward 

 from Baring Head towards Port Nicholson for some distance the mouths 



