Williams, D.N. 1973 Ohariu fault zone investigations at Porirua. Geological report on drilling results in block 20. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 157 5 p.
Abstract: In November 1972, a report by Mr T.L. Grant-Taylor (of N.Z. Geological Survey) relating to the position of the Oharia Fault was supplied to Ministry of Works Town and Country Planning Branch, for consideration in the Porirua City District Scheme Review. Subsequently, Geological Survey was asked to supply additional information because of Ministry of Works Housing Division projects in the area. From January to April, 1973, the areas Block 20 and Block 21 were studied in detail. This report relates only to investigations in the part of Porirua reclamation known as block 20. A preliminary report on drilling results (16 April, 1973) has already been circulated. (auth)