Man and the Glacial PeriodWright, G. Frederick (George Frederick)
History
Man and the Glacial Period
Wright, G. Frederick (George Frederick)
Glacial epoch; Prehistoric peoples
An interesting episode of this expedition was the experience of the crew
of the ship Hansa, which was caught in the ice and destroyed. The crew,
however, escaped by encamping on the ice-floe which had crushed the ship.
From this, as it slowly floated towards the south through several degrees
of latitude, they had opportunity to make many important observations
upon the continent itself. As viewed from this unique position the coast
had the appearance everywhere of being precipitous, with mountains of
considerable height rising in the background, from which numerous small
glaciers descended to the sea-level.
In 1888 Dr. F. Nansen, with Lieutenant Sverdrup and four others, was
left by a whaler on the ice-pack bordering the east of Greenland about
latitude 65°, and in sight of the coast. For twelve days the party was
on the ice-pack floating south, and so actually reached the coast only
about latitude 64°. From this point they attempted to cross the inland
ice in a northwesterly direction towards Christianshaab. They soon
reached a height of 7,000 feet, and were compelled by severe northerly
storms to diverge from their course, taking a direction more to the west.
The greatest height attained was 9,500 feet, and the party arrived on the
western coast at Ameralik Fiord, a little south of Godhaab, about the
same latitude at which they entered.
It thus appears that subsequent investigations have confirmed in a
remarkable manner the sagacious conclusions made by the eminent Scotch
geologist and glacialist Robert Brown in 1875, soon after his own
expedition to the country. "I look upon Greenland and its interior
ice-field," he writes, "in the light of a broad-lipped, shallow vessel,
but with chinks in the lips here and there, and the glacier like viscous
matter in it. As more is poured in, the viscous matter will run over the
edges, naturally taking the line of the chinks as its line of outflow.
The broad lips of the vessel are the outlying islands or 'outskirts';
the viscous matter in the vessel the inland ice, the additional matter
continually being poured in in the form of the enormous snow covering,
which, winter after winter, for seven or eight months in the year, falls
almost continuously on it; the chinks are the fiords or valleys down
which the glaciers, representing the outflowing viscous matter, empty the
surplus of the vessel--in other words, the ice floats out in glaciers,
overflows the land in fact, down the valleys and fiords of Greenland
by force of the superincumbent weight of snow, just as does the grain
on the floor of a barn (as admirably described by Mr. Jamieson) when
another sackful is emptied on the top of the mound already on the floor.
'The floor is flat, and therefore does not conduct the grain in any
direction; the outward motion is due to the pressure of the particles
of grain on one another; and, given a floor of infinite extension and a
pile of sufficient amount, the mass would move outward to any distance,
Public-domain text, read in full here on John Shaqi.
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