Geology
Fair Oak lies on the London Clay deposits of the Hampshire Basin, to the northern edge of a small syncline separated from the main basin by the Portsdown anticline. The London Clay in this area, towards the top of the sequence, is fairly sandy and includes lenticular sand deposits. The sand pits on the east of the village are in the Whitecliff Sand. At Knowle Hill and south towards Horton Heath the London Clay is overlain by the clays and sands of Wittering Formation of the Bracklesham Group, with a small outlier capping Pylehill to the north.
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