Browne, P.R.L. 1971 Petrological logs of drillholes, Broadlands geothermal field. Lower Hutt: New Zealand Geological Survey. Report NZGS 52 87 p.
Abstract: Petrographic descriptions of cores given in this report are based primarily on hand specimen and thin section examination. Mineral identifications have been checked by X-ray diffraction and infra-red analysis.