Gault Formation

The Gault Formation (also known as the Gault Clay) is a sequence of clays, mudstone and thin siltstones with bands of phosphatic nodules deposited between 100 and 112 million years ago in the Cretaceous period. Its outcrop stretches south-westward from East Anglia through Wessex to west Dorset, and surrounds the Weald in an arc from north-east Kent westwards through Surrey to Hampshire, where it turns south and returns eastwards through West and East Sussex.

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