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Paleozoic era, first major group of arthropods

Mesozoic era, characteristic spiral shell

Late Cretaceous period, apex predator

Most common in Paleozoic and Mesozoic eras, lamp-shells

Precambrian to present, layered bio-chemical accretion structures

Late Jurassic period, transitional fossil between birds and dinosaurs

Paleozoic to present, tiny marine organisms with intricate shells

Mesozoic era, first vertebrates with powered flight

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

Late Jurassic period, extremely long-necked dinosaur

Pleistocene epoch, early human species

Pleistocene to Holocene epoch, large woolly tuskers

Ordovician to present, ancient cephalopods with a hard shell

Throughout geological time, fossilized remains of terrestrial vegetation

Late Cretaceous period, small but cunning dinosaur

Mesozoic era, dolphin-like marine reptiles

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

Carboniferous period, extensive coal-producing tropical wetlands

Jurassic to present, ancient seed plant

Cambrian period, early marine predator

Ordovician to Permian periods, extinct group of sea scorpions

Mesozoic era, long-necked marine reptile

Cenozoic era, iconic prehistoric predator with long upper canines

Permian period, early synapsid with a sail on its back