Devonian
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The Devonian is a geologic period and system of the Paleozoic era during the Phanerozoic eon, spanning 60.7 million years from the end of the preceding Silurian period at 419.62 million years ago, to
The rocks of Lummaton Quarry in Torquay in Devon played an early role in defining the Devonian Period
Prototaxites milwaukeensis, the only known member of an unknown kingdom of life, from the Middle Devonian of Wisconsin
The Devonian Period marks the beginning of extensive land colonization by plants. With large land-dwelling herbivores not yet present, large forests grew and shaped the landscape.
Lycopod axis (branch) from the Middle Devonian of Wisconsin
Phanerozoic
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The Phanerozoic is the current and the latest of the four geologic eons in the Earth's geologic time scale, covering the time period from 538.8 ± 0.6 million years ago to the present. It is the eon du
Dalmanites limulurus, a species of Silurian trilobites
Cephalaspis, a jawless fish
Proterogyrinus, a Carboniferous amphibian (non-amniote tetrapod)
Plateosaurus, an early sauropodomorph dinosaur