Bowen, F.E. 1974 The Parahaki volcanics and their associated clays. Wellington: DSIR. DSIR Bulletin 215 p. 63
Abstract: The Parahaki volcanics comprises of three volcanic origins forming the bedrock areas. The clays are grouped into three zones from partly altered to a superimposed superficial zone, in which here, prospecting has revealed about 17 million tons of clay reserves of economic use
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