Hydrogeological sequence within the Thames Basin

A summary of the geological sequence present within the Thames Basin along with the aquifer classification. Jump to the key


Quaternary    
Neogene   Lenham Formation
Palaeogene Barton Group  
Bracklesham Group Camberley Sand Formation
Windlesham Formation
Bagshot Formation
  London Clay Formation
  Harwich Formation
Lambeth Group Woolwich Formation
Reading Formation
Upnor Formation
  Thanet Sand Formation
Cretaceous Chalk Group  
Selbourne Group Upper Greensand Formation
Gault Formation
Lower Greensand Group Folkestone Formation
Sandgate Formation
Hythe Formation
Atherfield Clay Formation
Wealden Group Weald Clay Formation
Tunbridge Wells Sand Formation
Wadhurst Clay Formation
Ashdown Formation
Purbeck Group  
Jurassic Portland Group  
  Kimmeridge Clay Formation
  Amphill Clay Formation
Corallian Group  
  Oxford Clay Formation
  Kellaways Clay Formation
Great Oolite Group Cornbrash Formation
Forest Marble Formation
White Limestone Formation
Taynton Limestone Formation
Fullers Earth Formation
Inferior Oolite Group  
Lias Group Whitby Mudstone Formation
Marlstone Rock Formation
Dyrham Formation
Charmouth Mudstone Formation

Key to hydrogeological sequence table


  Non-aquifer, mainly muds and mudstones
  Major aquifer, strategic importance, carbonates and sandstones
  Minor aquifer, locally important, variable lithology