Weald clay

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(Geol.) the uppermost member of the Wealden strata. See Wealden.

See also: Weald

References in periodicals archive ?
Drilling, using tried, trusted and safe conventional techniques, commenced with a 17y2-inch diameter vertical hole within the 300-metre thick Weald Clay rock unit, which directly underlies the well site.
it's likened to lowland Britain in miniature: you have a little bit of the South Downs, a bit of Norfolk, some of the High Weald clay, and there's quite a distinct area along the south coast known as the undercliff, as well as iconic features such as the Needles.