New Zealand geological map 1:25 000 (Industrial series) Whitford Sheet N42/9

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Kermode, L.O. 1986 New Zealand geological map 1:25 000 (Industrial series) Whitford Sheet N42/9. Wellington: Department of Scientific and Industrial Research. New Zealand Geological Survey industrial map series 1:25,000 N42/9 1 fold. map


Abstract: Rock types, mineral resources, and geological hazards in the Whitford area east of Manukau City Centre are shown on the accompanying map and described in the text. The Whitford sheet area, NZMS 1 N42/9, covers the hill country of the Whitford-Alfriston-Brookby districts, part of the flanking rugged Maraetai hills to the east, the rolling rural land of East Tamaki-Manurewa to the west, and part of the Clevedon-Papakura lowland in the south. The oldest rocks are strong, jointed and sheared greywacke and argillite (indurated sandstone and mudstone) of Late Jurassic age, that crop out in the Maraetai hills. Elsewhere they are deeply weathered and difficult to distinguish from younger, weathered, sedimentary rocks. Waitemata Formation of Miocene age comprises weak alternating sandstone and mudstone with interbeds mainly of volcanic grit and sand. Where weathered these rocks are difficult to distinguish from the younger Pleistocene alluvial terrace deposits. Alluvial pumice silt derived from the Taupo region is common in the East Tamaki area. Basalt lava flows and scoria cones are present in the northwest. Extraction of clay for brickmaking and rock for roading and fill are important mineral industries. Mass movement (landslip), volcanic risk, and potential earthquake responses are discussed as geological hazards. (auth)

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