Prehistoric
Early life
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Precambrian and Cambrian
The first life on Earth appeared not on land but in the oceans. There was not enough oxygen in the air to breathe and ultraviolet radiation, lethal to life forms, was still at...
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Ordovician, Silurian and Devonian
The Cambrian Period was followed, 487 million years ago, by the Ordovician Period. At that time many species died out, to be replaced by new ones in another evolutionary...
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Carboniferous Period
The Carboniferous Period lasted from about 359 to 299 million years ago. Plants had spread across the world’s continents and had evolved into many different kinds, including...
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Permian Period
During the Permian Period (299–252 million years ago), the humid, tropical forests of the Carboniferous gave way to vast, dry scrublands and deserts. Large amphibians, dependent...
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Early life A-Z
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Early amphibians and reptiles A-Z
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