Jökull


Jökull - 01.12.1982, Page 51

Jökull - 01.12.1982, Page 51
REFERENCES Boulton, G.S., P.N. Chroston and J. Jarvis, 1981: A marine seismic study of late Quaternary sedi- mentation and inferred glacier fluctuations along the coast ofwestern Inverness-shire, Scot- land. Boreas 10: 39-51. Buoge, T., G.H. Maisey and K. Rokoengen, 1974: Re- fleksjonsseismiske undersökelser med sparker utenfor Troms 1972. NTNF Kontinental-sokk- elprosjekt Pub. no. 49. Derbyshire, E., 1974: The bathymetry ofjökulsárlón, South-East Iceland. Geogr. J. 140: 269-274. Einarsson, Th. 1964: Aldursákvardanir á fornskelj- um. (Radiocarbon dating of sub-fossil shells). Náttúrufraedingurinn, 34: 127— 134. Eythórsson, J. 1953: French Icelandic Expedition to Vatnajökull; 1951. Polar Record, 6: 45. Holtedahl, H., S. Haldorsen and R. Vigran, 1974: Two sediment cores from the Norwegian continental shelf between Haltenbanken and Fröabanken (64° 06’N, 7° 39’E). Norges Geologiske Under- sökelser, Pub. 304: 1-20. Howarth, P.J. and R.J. Price, 1969: The proglacial lakes of Breidamerkurjökull and Fjallsjökull, Iceland. Geogr.J. 135: 573-581. Hutchinson, E.G., 1957: A Treatise on Limnology, vol. 1. John VViley and Sons, London. Krumbein, W.C. and L.L. Sloss, 1963: Stratigraphy and Sedimentation. Freeman, San Francisco. Sigbjamarson, G., 1970: On the recession of Vatna- jökull. Jökull 20: 50-61. Thorarinsson, S., 1939: The ice-dammed lakes of Ice- land with particular reference to their values as indicators of glacier oscilladons. Geogr. Ann. 21: 216-242. Thórarinsson, S., 1943: Oscillations of Icelandic glaciers in the last 250 years. Geogr. Ann. 25: 1 - 54. Tómasson,J. and E.G. Vilmundardóttir, 1967: The lakes Stórisjórand Langisjór. Jökull 17: 280-299. Manuscript accepted 20 May 1982 ÁGRIP LAGSKIPTING SETMYNDANA UNDIR JÖKULSÁRLÓNI G.S. Boulton, P. W. V. Harris og J. Jarvis University of East Anglia, Norwich Mælingar voru gerðar á dýpt Jökulsárlóns við Breiðamerkurjökul 1975, og á gerð setlaga undir lóninu 1976 með hjálp neistatækis. I ljós kemur að lónið er ekki grafið í klöpp eins og sumir höíðu áður talið, heldur nær það a.m.k. 120 metra niður ígegn- um lítt hörðnuð setlög. Undir Breiðamerkursandi getur því verið alldjúpur setfylltur dalur í framhaldi af Breiðamerkurdjúpi. Sagt er frá nýrri Cu grein- ingu á aldri fornskelja við Jökulsá, og stuðst við hana í ályktunum um aldur tiltekinna laga í sandin- um. JÖKULL 32. ÁR 47
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