The Geology of an area of accelerated erosion at Waerengaokuri, near Gisborne

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Abstract
Upper Tertiary rocks in the Waerengaokuri area form a faulted anticlinal sequence and are overlain unconformably by flat-lying lacustrine sediments of Early Pleistocene age. Rejuvenation of Te Aroha Stream by piracy in its headwaters has initiated a cycle of accelerated erosion in sheared sediments and diapirically extruded bentonitic mudstones associated with th.c fault zone. Rapid down-cutting in these rocks has left the weak lacustrine sediments unsupported, and they are slumping extensively. Diversion of drainage waters, artificial grading of sections of the stream channel, and the establishment of vegetative cover seem the most promising methods of inhibiting the rate of erosion and improving the stability of the slopes.

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