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References
A. Wegener : “The Origin of Continents and Oceans”, 1924, pp. 32–33.
Ibid. p. 37.
H. S. Washington's estimate is from 15 to 20 km. (9 to1 12½ miles), Journ. Washington Acad. Sci., vol. 14 (1924), p. 437.
Q.J.G.S., vol. 78 (1922), pp. 250–54, and “Island of Mull”, Mem. Geol. Surv., 1924, p. 278.
Journ. Washington Acad. Sci., vol. 14 (1924), p. 468.
That the first stage of the differentiation of igneous rock is into an acid and basic magma is, to my mind, abundantly proved by Dr. W. A. Richardson and G. Sneesby's analysis of the frequency of igneous magmas of different silica percentages. This clearly shows two distinct peaks, one acid and the other basic, Min. Mag., vol. 19 (1922), pp. 303–13.
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EVANS, J. Regions of Tension and Continental Drift. Nature 116, 173–175 (1925). https://doi.org/10.1038/116173a0
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DOI: https://doi.org/10.1038/116173a0