Summary.

The following conclusions have been reached:—

(1.) The south-western extremity of the North Island of New Zealand is probably a horst isolated by subsidence of land blocks on the west and on the south, and possibly on the east also.

(2.) The drainage-system has been developed by normal processes during a long period of elevation punctuated by pauses, the amount of elevation being at least 800 ft., and probably more.

(3.) The nature of the longitudinal drainage suggests that adjustment to structure was established in an earlier erosion period.

(4.) A prominent feature, Port Nicholson, has been produced by the subsidence of a block along lines which, with one notable exception, have not been clearly recognized.

(5.) This exception is the line of the Wellington fault, along which fault scarp topography is well developed.

(6.) Recent changes of drainage have had the effect of destroying, rather than completing, previous adjustment to structure.

(7.) This is attributable to the activity of transverse streams on and near to fault-scarps.