Sand movement at Mangatawhiri Spit and Little Omaha Bay

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Abstract
Evidence that sea-level fluctuation is probably an important cause of coastal change is presented. Grain size and feldspar/quartz ratios of sand samples, together with malacological evidence, show that sand is transported to Mangatawhiri Spit from depths of 15 fathoms during periods of progradation, and that effective sand movement probably also occurs down to depths of 20 fathoms. Effects of grain size on feldspar content are given in Appendix 3.

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