Náttúrufræðingurinn - 1958, Blaðsíða 29

LANGISJÓR OG NÁGRENNI
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SUMMARY
The Lake Langisjór and its Surroundings, South Iceland
by Guðmundur Kjartansson.
Museum of Natural Histoiy, Reykjavik
Tlie lake Langisjór occupies a trough-sliaped depression between steep
mountain ridges stretching out from the southwestern edge of the Vatnajökull.
It was discovered and namecl by Þorvaldur Thoroddscn (1890, 1895), whose
broad description of the topography is referretl to. The surroundings of the
lake are a typical Móberg area as defined by the author:
Within the so-called Móberg (or Palagonite) Formation of Iceland three
large areas stand out as the most typical, both in regard to petrology and
morphology. These (in the strict sense) are the móberg areas of (1) South-
West, (2) North, and (3) Middle South Iceland (Kjartansson 1956 a, fig. 1).
The bedrock of these areas is largely made up of the móberg, which is brown
basaltic glass, itself fragmentated and containing in various quantities frag-