On the southern side of the Isle of Sheppey, Elmley Hill offers a quiet but demanding introduction to the London Clay. Lobster and fish remains occur in phosphatic nodules, with other fossils in pyritic shingle. Finds can be sparse, the walk is long and the shore is muddy; arrange reserve-manager permission before leaving the marked trail to collect. Eocene, Cliffs and Foreshore, Rating: ♦♦♦