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Updated: June 21, 2025
Lyell's conclusion, therefore, is thus far confirmed in the southern hemisphere; and it is the more important, as one is naturally tempted to admit so simple an explanation, that it was the ice-period that caused the extinction of the numerous great mammifers which so lately swarmed over the two Americas.
Farther Correspondence with Humboldt. Second Visit to England. Continuation of "Fossil Fishes." Other Scientific Publications. Attention drawn to Glacial Phenomena. Summer at Bex with Charpentier. Sale of Original Drawings for "Fossil Fishes." Meeting of Helvetic Society. Address on Ice-Period. Letters from Humboldt and Von Buch.
I in no way reproach you, my dear friend, for the urgent desire expressed in all your letters, that your oldest friends should accept your comprehensive geological view of your ice-period.
I have been asked whether this inference was not inconsistent with the fact that a rich vegetation preceded the ice-period, a vegetation sufficiently abundant to sustain the tropical animals then living throughout the temperate regions.
Above that height all was broken and rugged, the line of separation being as defined as on any valley wall in Switzerland. It was again impossible to decide, on such short observation, whether these effects were due to local glacial action, or whether they belonged to an earlier general ice-period.
Another berg-dotted lake into which the drainage of the Braided Glacier flows, lies a few miles to the westward and is one and a half miles long. Berg Lake is next the remarkable Girdled Glacier to the southeastward. When the ice-period was in its prime, much of the Muir Glacier that now flows northward into Howling Valley flowed southward into Glacier Bay as a tributary of the Muir.
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