14. Lower green sand. Species of shells, etc., nearly all distinct from those of Upper Cretaceous.

F. Wealden.

15. Weald clay, of fresh-water origin. Shells of Pulmoniferous mollusca.

16. Hastings sand. Fresh water. Reptiles of, etc.

17. Purbeck beds. Limestone, calcareous slate, etc. Roots of trees; plants, etc.

G. Oölite.

18. Upper Oölite. Portland building-stone, sand.

19. Middle Oölite. Oxford clay, dark-blue clay. Large saurians.

20. Lower Oölite. Preponderance of ganoid fish. Plants chiefly cycads, conifers, and ferns.

H. Lias.