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Dactylioceras commune, snakestone ammoniteSnakestone ammonite (Dactylioceras commune) (J. Sowerby) a lectotype specimen from Toarcian, Upper Liassic, Bifrons Zone, Whitby, U.k
Belemnite longitudinal section to show phragmoconeA longitudinal section of a belemnite (Acrocoelites vulgaris) from Toarcian, Alum Shales, Ravenscar, Yks; unreg