GAULT
Gault
Gault is a clay formation of stiff blue clay deposited in a calm, fairly deep water marine environment during the Lower Cretaceous Period . It is well exposed in the coastal cliffs at Copt Point in Folkestone, Kent, England, where it overlays the Lower Greensand formation, and is found in exposure on the south side of The North Downs and the north side of the South Downs. It is also to be found beneath the scarp of the Berkshire Downs, in the Vale of White Horse, in Oxfordshire, England, and on the Isle of Wight where it is known as Blue Slipper. Gault underlies the chalk beneath the London Basin, generally overlying eroded rocks of Jurassic and Devonian age; ...The above text is a snippet from Wikipedia: Gault
and as such is available under the Creative Commons Attribution/Share-Alike License.