Glacier tracks

Rocks below the terminus of Franz Josef glacier, New Zealand. This glacier has advanced and retreated many times, evidently including here. It moved from left to right in this view. Quite a few separate channels and grooves seem to be cut into this highly-striated bedrock. The many near-horizontal scratches (as in upper left) were most likely caused by rocks in the glacier scraping against the bedrock as the glacier moved by.

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