Henderson, J.; Grange, L.I. 1926 The geology of the Huntly-Kawhia subdivision, Pirongia and Hauraki divisions. Wellington: Government Printer. New Zealand Geological Survey bulletin 28 112 p.
Abstract: The Huntly-Kawhia subdivision, of which the northern boundary is about thirty-eight miles south of the city of Auckland, includes the survey districts of Coast, Awaroa, Rangiriri, Whaingaroa, Newcastle, Komakorau, Maungakawa, Karioi, Alexandra, Hamilton, Albatross, Kawhia North, Pirongia, and Puniu, in all an area of 1,790 square miles. This subdivision contains no minerals of high intrinsic value such as precious metals, but it is richly endowed with brown coal, limestone, and clays of various kinds. Its pumice sands, useful for heat insulation and other purposes, occur in practically inexhaustible amount. Besides describing the areal geology, this bulletin deals with these mineral resources. (auth/DG)