Interim report of the geology of the Lower Waitaki River between Kurow and Black Point

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Mansergh, G.D. 1974 Interim report of the geology of the Lower Waitaki River between Kurow and Black Point. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 196 42 p.

Abstract: In a summary of geological investigations Mansergh (1973) suggested on the evidence then available, namely shallow boreholes and seismic data, that over much of its length between Kurow and Black Point the Waitaki Valley floor was filled to a depth of at least 120 m with alluvium. No boundaries were given but it was implied that alluvium could be found to this depth across the full width of the valley floor, that is the area covered by Quaternary deposits. Recent drilling for groundwater investigation has indicated that sedimentary rocks had unconsolidated coal measure sand of Tertiary age will be encountered in places within 3 m of the surface along the proposed canal line. This report is based on the reinterpretation of previous data and the results of percussion drilling on odd numbered sites 1-13. A geological map and cross section (Fig. 1), and logs for site 1, BHLW 108 and 109, and interim logs for boreholes BHLW 110, 112, 113, 115, 117 and 119 for odd numbered sites 3-13 respectively are attached to this report. The interim drill logs are interpretive rather than descriptive, the only possible evidence for compacted or lithified sediment being present in BHLW 117. Logs for BHLW 11, 12, 24, 25 and 29 are also included. (auth)