Ice Engraved Namibia Science


Finland and Namibia in southern Africa are united by at least a long history of development cooperation and traces of the ice age. Like the coasts of Finland, the desert valleys of Namibia are bordered by siliceous rocks sanded and scraped by the ice age. However, Namibia was already covered by ice about 300 million years ago. At that time, at the end of the Coal Age, the last great ice age was lived. We did not feel it, because Finland and the rest of Ancient Europe were located in warm latitudes. Continental glaciers covered the southern ends of Africa and South America, among others, grouped around the South Pole.

Signs of the then ice age have survived on other southern continents and in other parts of southern Africa. The moraine mixture, known to Finns, collected by ice, has been petrified in many places.

Similarly, there are remnants of fjords resembling the Norwegian coast, which were carved by mountain glaciers that flowed towards the sea. However, Namibia is unique in that only an entire network of fjords has survived, says an international team Geology-in leaf.

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The fjords remained under the rock

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Researchers identified the fjord from the mountainous and desert northwestern part of Namibia, where it covers an area about half the size of Lapland. A series of U-shaped valleys with a depth of 400 to 1,200 meters, a width of 1 to 5 kilometers and a length of 80 to 120 kilometers have carved into the hard ancient bedrock. The shape of the valleys and the fact that the surfaces have been polished like Finnish cliffs reveal that they are shaped by ice.

The valleys survived because they were initially covered. At the end of the ice age, they first accumulated moraine and sand carried by ice and glacial rivers. Then came the seabed sediments as the sea level rose as the continental glaciers melted. As it thickened, the strata petrified into sedimentary rock, which very slowly wore off. Now there are only remnants of soft sedimentary rocks left, and the ancient valleys remembering the weight of the ice are well visible again.


Source: Tiede by www.tiede.fi.

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