{Metal Age Deposits } {Recent {Neolithic " } Superficial {Pleistocene {Palaeolithic " } Deposits { {Glacial " } T{ E{ {Cromer Series } R{ {Weybourne Crag } T{Pliocene {Chillesford and Norwich Crags } Sands chiefly I{ {Red and Walton Crags } A{ {Coralline Crag } R{ Y{Miocene Absent from Britain { { {Fluviomarine Beds of Hampshire } { {Bagshot Beds } {Eocene {London Clay } Clays and Sands { {Oldhaven Beds, Woolwich and Reading} chiefly { {Thanet Sands Groups } { {Chalk } { {Upper Greensand and Gault } Chalk at top {Cretaceous {Lower Greensand } Sandstones, Mud S{ {Weald Clay } and Clays below E{ {Hastings Sands } C{ O{ {Purbeck Beds } N{ {Portland Beds } D{ {Kimmeridge Clay } A{ {Corallian Beds } R{Jurassic {Oxford Clay and Kellaways Rock } Shales, Sandstones Y{ {Cornbrash } and Oolitic { {Forest Marble } Limestones { {Great Oolite with Stonesfield Slate} { {Inferior Oolite } { {Lias--Upper, Middle, and Lower } { { {Rhaetic } { {Keuper Marls } {Triassic {Keuper Sandstone } Red Sandstones and { {Upper Bunter Sandstone } Marls, Gypsum and { {Bunter Pebble Beds } Salt { {Lower Bunter Sandstone }