Náttúrufræðingurinn - 1958, Side 29

LANGISJÓR OG NÁGRENNI
171
Noe-Nygaard, A. 1940. Sub-Glacial Volcanic Activity in Ancient ancl Recent
Times. Folia geogr. dan. 1: 4—67.
Pálsson, Ólafur 1884—85. Könnuð fjöll sumarið 1884. Suðri 2: 127 og 3: 1—2.
Pálsson, Sveinn 1945. Ferðabók Sveins Pálssonar. Reykjavík.
Peacock, M. A. 1926. The Volcano-Glacial Palagonite Formation ol Iceland.
Geol. Mag. 63: 385-399.
lleck, Hans 1921. tíber vulkanische Horstgebirge. Z. Vulkanol. 6.
Rist, Sigurjón 1956. íslenzk vötn. Reykjavík.
Sonder, R. A. 1938. Zur magmatischen und allgemeinen Tektonik von Island.
Schweiz. Min. Petr. Mitt. 18: 429—436.
Tlioroddsen, Þorvaldur 1890. Ferð til Veiðivatna sumarið 1889. Andvari 16:
46-115.
— 1894. Ferð um Vestur-Skaptafellssýslu sumarið 1893. Andvari 19: 44—161.
— 1893—94. Rejse i Vester-Skaptafells Syssel paa Island i Sommeren 1893.
Kgl. danske geogr. Selskabs. Skrifter 12: 167—234.
— 1895. Ferð um Austur-Skaptafellssýslu og Múlasýslur sumarið 1894. And-
vari 20: 1—84.
— 1914. Ferðabók 2, Kaupmannahöfn.
Þórarinsson, Sigurður 1943. Oscillations of the Iceland Glaciers in the Last
250 Years. Geogr. Ann. Stockh. 25: 1—54.
— 1956. The Thousand Years Struggle against Ice and Fire, Reykjavík.
Uppdráttur íslands 1844 eptir landmælingum Bjarnar Gunnlaugssonar.
Reykjavík og Kaupmannahöfn.
Uppdráttur íslands 1943, 1945 og 1953. Geodætisk Institut, Kaupmannahöfn.
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-