| Alaska, 1979 | |
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This channel, like the main trough of Glacier Bay in the foreground, once was filled with ice. On the wall of the fjord is a layer of debris and rock flour—glacial till—that the glacier left behind. Rock flour also gives the water its milky color. Landforms made of till are called moraines; the lobes of till high on the slope were once lateral moraines, plastered in place along the edge of the ice. The moraines here are very well preserved, considering the rainy climate.
