... marine and fresh-water Strata. Upper Neocomian. Folkestone and Hythe Beds. Atherfield Clay. Similarity of Conditions causing Reappearance of Species after short Intervals. Upper Speeton Clay. Middle Neocomian. Tealby Series. Middle Speeton Clay. Lower Neocomian. Lower Speeton Clay. Wealden Formation. Fresh-water Character ... — The Student's Elements of Geology • Sir Charles Lyell