Colin Woodroffe

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Balls Pyramid and the efficacy of marine abrasion part of Vignettes:Vignette Collection
Balls Pyramid is a striking example of the penultimate stage in the marine planation of a volcanic island. It is a remarkable monolith of basalt that rises spectacularly to a height of 551 m (Fig. 1), as wave ...

The Cocos (Keeling) Islands, and what coral reefs can tell us about changes of sea level part of Vignettes:Vignette Collection
The Cocos (Keeling) Islands in the eastern Indian Ocean are the only atoll that Charles Darwin visited during the voyage of the Beagle.Darwin had developed a theory that gradual subsidence of volcanic islands in ...