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Late Jurassic period, transitional fossil between birds and dinosaurs

Mesozoic era, first vertebrates with powered flight

Late Jurassic period, known for plates on back and spiked tail

Devonian to present, thought to be extinct until found in 1938

Mesozoic era, dolphin-like marine reptiles

Mesozoic era, characteristic spiral shell

Pleistocene epoch, early human species

Cambrian period, peculiar creature known from the Burgess Shale

Late Cretaceous period, apex predator

Permian period, early synapsid with a sail on its back

Precambrian to present, layered bio-chemical accretion structures

Ordovician to present, ancient cephalopods with a hard shell

Paleozoic to present, tiny marine organisms with intricate shells

Ordovician to Permian periods, extinct group of sea scorpions

Late Jurassic period, extremely long-necked dinosaur

Carboniferous period, extensive coal-producing tropical wetlands

Pleistocene to Holocene epoch, large woolly tuskers

Throughout geological time, fossilized remains of terrestrial vegetation

Cenozoic era, iconic prehistoric predator with long upper canines

Late Cretaceous period, small but cunning dinosaur

Paleozoic era, first major group of arthropods

Most common in Paleozoic and Mesozoic eras, lamp-shells

Jurassic to present, ancient seed plant

Cambrian period, early marine predator