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Silurian
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The Silurian is a geologic period and system spanning 23.5 million years from the end of the Ordovician Period, at 443.1 Ma to the beginning of the Devonian Period, 419.62 Ma. The Silurian is the thir
Ordovician-Silurian boundary on Hovedøya, Norway: the brownish late Ordovician mudstone and later dark deep-water Silurian shale layers have been over
Ordovician-Silurian boundary on Hovedøya, Norway: the brownish late Ordovician mudstone and later dark deep-water Silurian shale layers have been overturned by the Caledonian orogeny.
Fossils of the late Silurian sea bed, England
Fossils of the late Silurian sea bed, England
Diorama of a Silurian seafloor
Diorama of a Silurian seafloor
Cooksonia, the earliest vascular plant, middle Silurian
Cooksonia, the earliest vascular plant, middle Silurian
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
Silurian
…geologic period and system spanning 23.5 million years from the end of the Ordovician Period, at 443.1 Ma (million years ago) to the beginning of the Devonian Period, 419.62 Ma. The Silurian is the third and shortest period of the Paleozoic Era, and the third of twelve periods of the Phanerozoic Eon. As with…
The rocks of Lummaton Quarry in Torquay in Devon played an early role in defining the Devonian Period
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
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 g
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
Lycopod axis (branch) from the Middle Devonian of Wisconsin