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38
I. PHYSICAL GEOGRAPHY OF SWEDEN.
The ordinary gneisses predominate in the western parts of the
kingdom as far north as Dalarne; they also occur in several of the
eastern provinces, viz. Östergötland, Södermanland, Gestrikland,
Helsingland, Medelpad, and Ångermanland, as well as in the coast-regions
of Vesterbotten and a certain area in Lappland.
Mt. Ruotivare, Lappland.
Granulitic gneisses, >hälleflintas», and mica-schists, all belonging to
the upper part of the Archæan, extend over vast areas of
Ångermanland, Vesterbotten, and Lappland, and are besides extensively
developed in southern Dalarne, Nerike, and Vestmanland; they also occur
in many localities of Uppland, Östergötland, Vermland, and eastern
Småland. These latter Archæan rocks are noteworthy, because it is
in them the principal ore-deposits of Central Sweden are met with,
iron-ores as well as pyrites. These ores will be considered further on
under the head of Mining.
Now and again layers and lenticular masses of crystalline
limestone (marble) are found intercalating the above-named fine-grained
rocks and also certain coarse-grained gneisses. This is especially
the case in the eastern part of Central Sweden, that is, in eastern
Vermland, in Nerike, Vestmanland, southern and eastern Dalarne,
Uppland, Södermanland, and Östergötland. At several places in these
districts the crystalline limestone is made use of for architectural and
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