In 1941, geologists Harold Wellman and Dick Willett travelled down the West Coast between Hokitika and Lake McKerrow in search of minerals. They noticed that there was an abrupt western boundary to the Southern Alps. This sketch from Willett’s notebook shows a notch (far left) where the Alpine Fault crosses a saddle and the steep mountain front.
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Reference:
R. W. Willett, field notebook, 1941.
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