The Fossils of the South Downs: Or, Illustrations of the Geology of Sussex

Ammonites animal aperture appearance beaks beds belong beneath bivalve Blue chalk marl blue clay blue marl bones Brighton calcareous carbonate of lime casts cavities characters cliffs colour composed compressed Conch contains convex costæ covered crystals Cuvier cylindrical deposit depressed diameter discovered dorsal dorsal fin exhibits external feet ferruginous fish flint formation fossil fragments genus Geological Transactions green sand grey marl Hamites Hamsey hills hinge imbedded inches long inner Inoceramus iron sand Lewes Lewesiensis limestone Localities longitudinal Lower chalk margin Mary Ann Mantell Middleham nearly numerous oblique observable occur organic remains original outer papillæ Parkinson Plastic clay posterior present species remarkable resembles ribs ridges Ringmer rows of tubercles sandstone septa shell side siliceous smooth South Downs specimens spines Squalus strata striæ striated structure substance sulci surface Sussex teeth thick Tilgate transverse Turrilites undulated Upper chalk valve vegetables Ventriculites vertebræ Vide volutions Weald clay zoophyte