Engineering Geologist Pete Hobbs with the British Geological Survey told iWeather Online that the rock slide was most likely associated with a “wedge failure”. Mr. Hobbs said the collapsed material comprised “a mixture of slate and sandstone, and was Devonian in age”. The video is one of the best examples of a rockslide I have seen in the UK. Initial estimates would suggest that between 50,000 to 100,000 tonnes of earth and rock slid into the sea. It was so large that it produced a wave, which radiated out in a semi-circular front out to sea”, Mr. Hobbs stated.
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