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Prehistoria (663)

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! EN_90246614_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Artist's impression of a Tertiary period landscape. This period extended from 65 to about 2 million years ago and is divided into five epochs: the Paleocene, Eocene, Oligocene, Miocene and Pliocene. Dinosaurs died out early on in the Tertiary, and mammals progressed rapidly. This illustration shows some of the reptiles and mammals of the epoch, which included the elephant- like dinotherium and mastodon, also the sabre- toothed tiger. Anthropoid apes appeared, and towards the end the present forms of continents developed. Temperatures dropped signalling the beginning of the ice-ages at the end of the Pliocene.
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! EN_90274045_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Prehistoric sea level map. Published in 1913, this map shows changes in rivers and drainage patterns with sea level changes in Western Europe in prehistoric times (40,000 to 100,000 years ago). The map shows existing land masses (green) together with land masses which existed when sea levels were much lower than now (light green). At such times the rivers (blue) flowed across grassy plains now covered by sea. Sea levels are linked to periods of glaciation when much of the Earth's water is frozen to make glaciers, resulting in a drop in sea levels. Map from the 1913 edition of Prehistoric Times (Sir John Lubbock).
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! EN_90274045_0002 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Prehistoric sea level map. Published in 1913, this map shows changes in rivers and drainage patterns with sea level changes in Western Europe in prehistoric times (40,000 to 100,000 years ago). The map shows existing land masses (black) together with land masses which existed when sea levels were much lower than now (grey). At such times the rivers (white lines) flowed across grassy plains now covered by sea. Sea levels are linked to periods of glaciation when much of the Earth's water is frozen to make glaciers, resulting in a drop in sea levels. Map from the 1913 edition of Prehistoric Times (Sir John Lubbock).
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