North-west winds lift dust from the Dart riverbed at the head of Lake Wakatipu. This fine dust can be carried hundreds of kilometres to the east, and deposited as a layer of silt, known as loess. In leeward (eastern) parts of the South Island, many fertile soils have formed from loess – blown from riverbeds in the great outwash plains of past glaciations.
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Natural Sciences Image Library of New Zealand
Photograph by G. R. Roberts
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