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GEOLOGY.
41
Lead-glance containing silver is fonnd at Sala, Nya Kopparberg,
Guldsmedshyttan, and Kallmora silver-mine in Vestmanland, as well as
in some places in Dalarne, Vermland, and Dalsland. To any considerable
amount it is worked chiefly at Sala. At the zinc-mines of Åmmeberg,
in the neighbourhood of Askersund, the most important beds of zinc-ore
("Blende) are found. Manganese-ore (Hausmannite) is found at Bölet,
north of Karlsborg, and at Spexeryd and Hohult, south of Jönköping.
Precambrian. In several parts of the country greater and smaller
districts are found where the rock-basement consists of a series of red
sandstones in connection with conglomerates and clay-slates. These rocks
have been formed prior to the Cambrian period and are therefore called
Precambrian. Such Precambrian series are developed over large areas
of western Dalarne and Herjedalen (Dala-sandstone), in the district
between Gefle and Storvik (Gefle-sandstone), and in the neighbourhood
of Almesåkra, south of Jönköping (the Almesåkra group). Smaller
deposits of similar kind are found in Ekerön and a couple of very
small islands in lake Mälaren, at Svartelfven in Vermland, and in the
coast-islets of Ångermanland.
Of Precambrian age is probably also the so-called Dalsland-group
or Dal-formation, which extends over the eastern part of Dalsland,
known for its beautiful scenery. This formation consists of a great
series of conglomerates, sandstones, and slates of different kinds, up-
Tännfor8en Falls in Winter garb.
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