Geologist Charles Cotton often produced composite diagrams showing how a landscape had developed. This two-stage sketch shows a lava plateau (rear) that has been progressively eroded so that there are only remnants of the lava on the tops of hills (front).
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Te Ara - The Encyclopedia of New Zealand
Reference:
Charles Cotton, Geomorphology. Wellington: Whitcombe & Tombs, 1942, fig. 350
Pen and ink drawing by Charles Cotton
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