A series of beds of clay, sandstone, limestone, and ironstone, forming the top of the Wealden strata in southern England and containing abundant fossil remains.
- ‘As the uplift cycles waned an extensive mud plain developed that is preserved as the Weald Clay.’
- ‘The Weald Clay we now find there represents the muddy bottom of this lake.’
- ‘They carried out pumping trials to demonstrate that vacuum-assisted drainage using an array of ejector wells would be effective in controlling pore pressures in the Weald clay.’
We take a look at several popular, though confusing, punctuation marks.