The Gault Formation consists of gault and the Upper Greensand. These represent different facies, with the sandier parts probably being deposited close to the shore and the clay in quieter water further from the source of sediment; both are believed to be shallow-water deposits.
The Gault Formation represents a marine transgression following erosion of the Lower Greensand. It is subdivided into two sections, the Upper Gault and the Lower Gault. The Upper Gault onlaps onto the Lower Gault. The Gault Formation thins across the London Platform and then terminates against the Red Chalk just to the south of The Wash.
Gault exposure at Copt Point, which is the type locality for the formation, is 40 m in thickness.
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