Transactions of the Royal Society of New Zealand . the upper Fig. 10, a sketch of a little valley part of the vaiiey. truncated by the Ngahauranga, gives an indication of the depth to which the latter has incised its course below an older surface of moderate relief. The Kaiwarra, which is the larger stream of the two, has graded itscourse, and for a distance of a mile from its mouth has worked out anextremely narrow strip of flood-plain (Plate XX, fig. 1). The Ngahau-ranga is not graded. A fall in its lower course is illustrated in Plate XX,fig. 2. There is no doubt that both these streams are
Transactions of the Royal Society of New Zealand . the upper Fig. 10, a sketch of a little valley part of the vaiiey. truncated by the Ngahauranga, gives an indication of the depth to which the latter has incised its course below an older surface of moderate relief. The Kaiwarra, which is the larger stream of the two, has graded itscourse, and for a distance of a mile from its mouth has worked out anextremely narrow strip of flood-plain (Plate XX, fig. 1). The Ngahau-ranga is not graded. A fall in its lower course is illustrated in Plate XX,fig. 2. There is no doubt that both these streams are of extremely recentorigin. Their lower courses are consequent upon the slope of the fault-scarp, or, at least, of the boundary of the Port Nicholson depression. Next to the extremely young character of the streams the most im-portant piece of evidence in favour of faulting is the abrupt manner in whichthe ridges separating them are terminated as a straight line of cliffs atthe harbour side. If the theory of faulting is not entertained these must. Loc. cit., p. 539. I Trans. Vol. XI!V. Plate XX.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscience, bookyear1911
