Geological map of New Zealand 1:50,000 Sheet N27 (part) Richmond

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    Johnston, M.R. 1982 Geological map of New Zealand 1:50,000 Sheet N27 (part) Richmond. 1st ed. Lower Hutt: New Zealand Geological Survey. Geological map of New Zealand 1:50,000 N27. 1 fold. map + 1 booklet

    Abstract:  The Richmond sheet area at the head of Tasman Bay includes part of the Moutere Depression, and in the southeast a small segment of the Nelson Regional Syncline. The area is dominated by low, regularly dissected hills developed on thick, weakly consolidated clay-bound Moutere Gravel of late Pliocene-early Pleistocene age. The gravel overlies poorly known rocks consisting of the Separation Point Batholith in the west, and the igneous Rotoroa Complex and sedimentary Brook Street Volcanics in the east of the depression. Early Cenozoic consolidated coal measures and shallow water marine sediments (Jenkins Group) locally underlie the gravel, and adjacent to the Waimea Fault bounding the southeast margin of the depression, the coal measures are poorly exposed. East of the fault and underlying higher hills of the Barnicoat Range are indurated sediments of the Nelson Regional Syncline. They are separated by the northeast-striking Eighty-eight Fault into the Richmond Group in the west, and the upper part of the Maitai Group. The Richmond Group is less indurated than the Maitai Group and is also more fossiliferous, with numerous conglomerates and acid igneous sediments. Upper Quaternary terrestrial deposits are confined to major north-striking valleys incised into Moutere Gravel by the Moutere River in the west and Waimea River in the east, where locally they form confined and unconfined aquifers. Fronting Tasman Bay, and underlying several islands, are Holocene marine sand and gravel. Periods of deformation occurred in the Early Cretaceous, Late Cretaceous or early Cenozoic, and late Cenozoic; the Maitai and Richmond groups are folded about numerous northeast and locally ENE-striking axes. Faulting is widespread, and the parallel Waimea, Heslington, Eighty-eight, and Whangamoa faults are active with a dextral component, reflecting continuing uplift of east Nelson and formation of the Moutere Depression


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