The land animals were still like the Wealden reptiles. Bones of large reptiles may at times be found on the shore at Shanklin. Several have been picked up recently. From the prevalence of cycads we may conclude that the climate of the Wealden and Lower Greensand was sub-tropical. The existing Cycadaceae are plants of South Eastern Asia, and Australia, the Cape, and Central America. The forest of trees allied to pines and firs and cedars probably occupied the higher land. Turtles and the corals point to warm waters. The existing species of Trigonia are Australian shells. This beautiful shell is found plentifully in Sydney harbour. It possesses a peculiar interest, as the genus was supposed to be extinct, and was originally described from the fossil forms, and was afterwards found to be still living in Australia. [Footnote 3: Carbonate of lime has been replaced by carbonate of iron, and the latter converted into peroxide of iron. At Sandown oxidation has gone through the whole cliff.] [Illustration: FIG. 2] COAST ATHERFIELD TO ROCKEN END Wl _Wealden Beds._ P _Perna Bed._ A _Atherfield Clay._ Ck _Cracker Group._ Lg _Lower Gryphaea Beds._ Sc _Scaphite. "_ Lc _Lower Crioceras "_ W _Walpen Clay._ Uc _Upper Crioceras Beds._ WS _Walpen and Ladder Sands._ Ug _Upper Gryphaea Beds._ Ce _Cliff End Sands._ F _Foliated Clay._ SU _Sands of Walpen Undercliff._ Fer _Ferruginous Bands of Blackgang Chine._ B _Black Clay._ S _Sandrock and Clays._ Wh _Whale Chine._ L _Ladder Chine._ Wp _Walpen Chine._ Bg _Blackgang Chine._ Chapter V BROOK AND ATHERFIELD