. La geografia della Nuova Zelanda. Depositi storici, fisici, politici e commerciali. ic è probabile, come detto prima, che alcuni di theseappartenevano in precedenza al fiume Motueka, e sono stati acquistati solo ultimamente dal Buller. Il vecchio corso del Buller, nella parte inferiore del suo flusso, originariamente si trovava attraverso la valle nowdruged dagli Inangahua e Mahwera, affluenti rispettivamente del Buller e del Gray. Questo corso è stato molto più lungo di quello ora seguito attraverso la gola Buller da Reefton a Westport. Thechange si è verificato dopo una depressione nel Cainozoicage. Era evidente

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. The geography of New Zealand. Historical, physical, political, and commercial . ic deposits.It is probable, as before stated, that some of thesebelonged previously to the Motueka River, andhave only lately been acquired by the Buller. The old course of the Buller, in the lower portionof its flow, originally lay through the valley nowdrained by the Inangahua and Mawhera, tributariesof the Buller and Grey respectively. This coursewas much longer than the one now followed throughthe Buller Gorge from Reefton to Westport. Thechange occurred after a depression in the Cainozoicage. It was evidently the result of the activity of aconsequent stream flowing down the coast ranges.Flowing in a short and steep channel, this streamcorroded its bed far more rapidly than the muchlonger Grey River, and when the latter was inter-cepted, its upper waters flowed down the newchannel. Thus the present Grey River is a beheadedremnant of the larger ancient stream. The lowsaddle between the upper Mawhera and Inangahuais an air-gap. The Inangahua is an obsequent, . SOUTH ISLAND RIVERS 157. Pltolo. Cut Tourist Dept. Gorj^e of Kiiller Biver, 158 GEOGRAPHY OF NEW ZEALAND the lower Buller a subsequent, and the gorge itselfa water gap. The rivers of the West Coast of the South Islandhave comparatively short hut steep courses. Theyrise near the summit of the ranges, often, especiallyin the more southern portions, in glaciers. In theirupper portions they pass through profound moun-tain valleys and gorges and. issuing from them, flow across the narrow coastal plains in wide riverbeds. On the coast, where the river current isstopped by the ocean, the shingle these rivers carryis heaped up into long gravel banks (p. 160).Through these banks the actual outlet of many ofthe smaller streams is ever changing. In manycases they may be closed for months by a heavygale, and they are not cleared until a heavy floodoccurs. The Haast and the Hollyford are to some extentexceptions, for both drain longitudinal v

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• bookauthorgregoryj
• bookcentury1900
• bookdecade1900
• bookyear1905