The Scandinavian Ice-Sheet


IN reply to the letter of Prof. T. G. Bonney (NATURE, vol. xlix. p. 338), which I by chance have read to-day, concerning the difficulty of explaining how the Scandinavian land-ice could have crossed the deep channel of Skagerak and Kattegat, and have reached the East Anglian coasts, I should like to remark that this difficulty is not new to me, and will exist after it has been explained how the ice-stream from Norway could have crossed the named channel and extended over Denmark and North-western Germany. It is, however, an undisputed fact that certain Norwegian boulders are very common in the most northern parts of Iylland, and from there dispersed over the whole Iylland (though their rarity increases with distance from Norway), the northern parts of Fyn and Sjœlland, over Slesvig and Holstein and North-western Germany from Fehmarn towards the west, further over Dutchland and Belgium to several localities at the English east coast, under such conditions that they could not have been transported by floating ice. It is consequently a fact that the ice-stream from Norway has crossed the named channel. I think, therefore, that the best explication is that the Skagerak channel in its present condition was at first formed after or during the period of largest glaciation, to which the Norwegian ice-stream belongs, but before the Baltic ice-streams, bot1 of which, I suppose, are posterior to the greatest extension of the land-ice. The chief reason for the formation of these ice-streams is the existence of the-above-named channel, which has prevented the ice-stream from Norway from extending over Denmark for the second time.

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