 The granite Lundy Island in the Bristol Channel dates from this period.The Alpine Orogeny that took place from about 50 million years ago was responsible for the shaping of the London Basin syncline and the Weald anticline to the south.This orogeny also led to the development of the North Downs, South Downs and Chiltern Hills escarpments, and the near-vertical folds in south Dorset and the Isle of Wight.