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CONFIGURATION.
13
1 hough south of the Ljusnan the highlands of Härjedalen and Hälsingland
approach to within a few miles of the sea; their peaks are occasionally
as much as 400 m or more, in height. In the Marine-Deposit Belt the
soil on the heights, however, is often shallow and dry, so that the
re-growth of the forest here is often inferior to that of the moraine districts
in the interior of the country.
The utmost Area of Sea during the Låte Glacial Period (The Yoldia Sea).
Present coasts indicated by faint lines.
The present coast-line in Norrland is only of a temporary character, inasmuch
as the upheaval of the land now going on (which for last century in the Quarken
was about 1 m and at Stockholm about 47 cm) causes the boundary constantly to
advance, so that fresh tracts of sea-bottom, exactly similar in nature to that just
described, are continually making their appearance. The valleys are continued
under the surface of the sea; the thousand islets, skerries and islands now
forming the "Skärgård", i. e. fringe of skerries, are but the first emerging tops of the
hills and summits of the future; the shallow sand and loam bottoms of the bays
are the fields, which, when eventually raised above the level of the sea, will be
taken possession of by the agriculturist. In the tracts abandoned and left dry
by the sea, when not immediately claimed for cultivation, coniferous forests
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