An illustrated introduction to sharks that lived during the Paleozoic, Mesozoic and Cenozoic eras.

Timeline -- What is a shark? -- Paleozoic sharks and their relatives -- "a new kind of fish" -- Cladoselache/stethacanthus -- Doliodus/pucapampella -- Orthacanthus -- Belantsea -- Falcatus -- Promexyele -- Edestus -- Helicoprion -- Mesozoic sharks and their relatives -"reptilian competition" -- Hybodus -- Palaeospinax -- Spathobathis/ischyodus -- Palaeocarcharias/protospinax -- Sclerorhynchus -- Cenozoic shark -- "swimming nightmare" -- Carcharodon megalodon -- Sharks today -- Further reading -- Glossary.