Acta naturalia Islandica - 01.02.1946, Side 81

ORIGIN OF THE BASlC TUFFS OF ICELAND
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20. A. L. Day and E. T. Allen: The Volcanic Activity and Hot Springs of
Lassen Peak. Carn. Inst. Wash. 1925.
21. Helgi Pjetursson: Om nogle glaciale og interglaciale Vulkaner paa Island.
Overs. over d. Kgl. danske Vidensk. Selsk. Forh. 1904. No. 4.
22. Cf. L. Hawkes’ results as to the glassy red partings of the plateau
basalts of Northern Iceland and the rapidity of the building up of this series.
The building up of the N-Atlantic Tertiary volcanic Plateau. Geol. Mag. Vol. III.
1916.
23. Carnegie Institution of Washington. Year Book No. 39, 1939—1940. Re-
port of the Geophysical Laboratory by L. H. Adams, Director. P. 29.
24. G. W. Morey: Development of pressure in magmas as a result of cryst-
allization. Journ. Wash. Acad. Sci. 12. 219, 1922.
25. Clarence N. Fenner: The Origin and Mode of Emplacement of the Great
Tuff Deposit of the Valley of Ten thousand Smokes. National Geogr. Soc.
Katmai Series, No. I. Washington 1923.
It is herewith stated by the editor on the author’s request that this paper
was received in August 1944.