The geometric cracks are likely caused by the repeated freezing and thawing of buried ice.
They can survive being completely desiccated in long Arctic winters, returning to growth in warmer times, but Dr La Farge was surprised by an emergence of bryophytes that had been buried under ice for so long.
Successive cold years drove the Vikings out of Greenland, where many of the Medieval Viking villages remain buried under snow and ice to this day.
There was none in Indianapolis, a city that may have been an atypical choice for a Super Bowl but ran an organized, efficient event (and unlike ice-buried Dallas in 2010, had the fortune of unseasonably warm weather).
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He underwrote an expedition to Greenland, and in 1992 it found the P-38 buried in 268 feet of ice.
But since the 1960s, satellites and aircraft with powerful radar devices have discovered more and more lakes buried kilometres beneath the thick ice sheet.
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The radar sends radio wave pulses into the ice sheet, and the waves bounce off buried features, informing researchers about the characteristics of the snow and ice layers.
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One striking sequence shows Endurance buried up to her deck in ice, a tangle of rigging and splintered timbers, every surface thickly covered with hoar-frost.
In Minnesota, Governor Mark Dayton declared a state of emergency after communities in the south-west of the state - already struggling to restore power from an earlier ice storm - were buried under heavy snow.
Alex Scott, SNH area officer for West Sutherland and Wester Ross (North), said the caves provided a unique record of Scotland's ancient history, as glaciers during the Ice Age erased many remains buried just below the surface of the ground.
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Any crater would have to be buried deep beneath thousands of tonnes of dense ice, so it's difficult to know where to start looking.
Louis plays a lo-fi version of himself, spending his days drifting through New York, brooding, bingeing on ice cream, slumping in wintry playgrounds, like Charlie Brown with a buried temper.
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