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decrease of temperature on the planet and the formation of large ice systems in the
north caused global modifications in the vegetative and animal world of the
Northern hemisphere. The borders of all natural zones began to shift to the south. On the
territory of Siberia the following natural zones were located: The zone of cold tundra and tundra –steppes
extended along the glaciers ten kilometers wide. It was located in those
areas, where wood land and taiga are now.
In the South tundra-steppe gradually turned in wood-steppe and
wood land. The wood regions were very small, and were not everywhere. More often
woods placed on southern shores of ice lakes, both in river valleys and on
spurs of mountains.
More to the south dry steppes were located; in the west of Siberia gradually turning
to the Sayn-Altai mountain system, in the east bounding with half-deserts of Mongolia. In
some areas tundra –steppes and steppes were not divided by stripes of
wood and gradually replaced one another.
In new climatic conditions of the Glacial
Epoch the world of animals was changing also. The new kinds of fauna became to form
for the last stages of the Quaternary Age in the northern hemisphere. The appearance of
the so-called Mammoth Fauna Complex was the most significant demonstration of these
modifications, and it consisted of more cold-enduring kinds of animals.
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