Brown, I.R. 1975 Whangarei City Corporation, engineering geological mapping for urban development. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 229 13 p.
Abstract: Engineering geological mapping of the Whangarei city area has enabled the delineation of areas where natural slopes have a high susceptibility of failure. These slopes are formed in weathered Tertiary rocks; slopes in Onerahi Formation are particularly troublesome. Further urban development in unfavorably areas will require careful investigation and design. (auth)