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Notes on glacial lakes

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Glacial Lake Origin
Test evidence.

If lakes have been formed by unequal subsidence & elevation of river valleys, then whenever lateral ravines debouched into the old river these ravines sh.[oul]d remain in the lake-bottom, - unless all filled up with sediment. Also the lake-bottom itself should contain the old river bed sometimes flowing between high banks or rocky channels. All indications both of the river channel & of all the channels of the lateral streams  could hardly have been obliterated by sediment.      If ground out by ice, however there should be no such channels but a rounded contour of lake-bottom its variations dependent on varying grinding force of the glacier, & on varying hardness of rock.

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Letter to Alfred Russel Wallace from the Royal Society, about his Darwin Medal award

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