English: Alum Bay from the Old Battery showing the multicoloured Paleogene sands and clays lying above the top of the Chalk. Immediately above the Chalk are the Reading Formation and the London Clay Formation. The colourful part of the cliffs are sands and clays of the Bracklesham and Barton Groups. At the northern end the sequence is the Headon Formation. The dip varies from very steep in the south to almost horizontal at the northern end, demonstrating the monoclinal structure
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