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ice sheet of the glacial epoch as it extended
seaward. Another independent evidence is displayed
at Tromsö, and well seen from the Belvedere.
Tromsö is a small oblong island, lying between
the mainland and the larger island Kvalö. It is
separated from KvalÖ by Sandesund, and from
the mainland by the Tromsösund. The width of
these two channels and the island together amounts
to about four miles. The mer de glace has poured
across this hollow, grinding down the island to its
present modest elevation, and has then passed on
to Kvalö. Now in the course of this short journey
across the valley—which, allowing for the
outspread of the hills on each side, is about six
miles—the level of the ice has fallen about five
hundred feet, as shown by the glaciation on the
opposite sides. The difference is well shown by
the contrasted engravings.
This inclination of 500 feet in six miles—about
1 in 60—would bring a glacier of 2000 feet
thickness on the shore down to the sea level in an
outward course of twenty miles, or less than half the
distance between the mainland and outlying rocks
of the Lofodens.
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