As the ice sheet disintegrated, it created at its front an immense proglacial lake, formed from its meltwaters, as the retreat of glacial margins is not caused by a reversal of the glacier's flow, but rather from melting of the ice sheet.
It created at its front an immense proglacial lake as the retreat of glacial margins is not caused by a reversal of the glacier's flow, but rather from melting of the ice sheet. An immense proglacial lake was formed from its meltwaters. The ice sheet disintegrated.