Abstract
EDINBURGH
Royal Society, November 5. L. M. DAVIES: The geology of Inchkeith. This island was last surveyed geologically by Sir Archibald Geikie in 1860. Col. Davies replaces Geikie's map by more modern ones; distinguishes between intrusive and extrusive igneous rocks, giving particulars as to their natures; and describes the sedimentary sequence throughout. The drift geology of the island is also systematically described for the first time; and a list is given of the fossils found on Inchkeith. Appendixes are added, on the drift deposits by Dr. R. Campbell, and on the entomostraca by Miss M. H.Latham. C.F.DAVIDSON: The Tertiary geology of the Island of Raasay, Inner Hebrides. The Tertiary igneous rocks of Raasay and South Rona include olivine-basalt lavas, an intrusive suite of acid and basic sills, and a large number of dykes. The major sills are riebeckite-bearing granophyres, and highly differentiated olivine-dolerite (crinanite) types with abundant segregations, including picrite, teschenite, syenite and numerous pegmatites. The petrogenesis of these is discussed. Comparable rocks are found in the dyke-suites, where differentiates also include analcite-basanite and analcite-tephrite. One olivine-dolerite dyke fuses granophyre xenoliths into pitchstone. Other analysed intrusions include a leidleite pitchstone dyke, a peridotite dyke and an elongated boss of gabbroidal teschenite, while a series of vents are believed to represent hot springs of Tertiary age. The paper concludes with notes on the recent earth-movements of these islands. B. P. WIESNER and N. M. SHEARD: The duration of life in an albino rat population. H. W. TURNBULL: The invariant theory of the correlation. This is an extension of methods already utilised in dealing with bilinear and quadratic forms to a class of transformations which occur in algebraic geometry, called correlations. The main results prove to be simpler than might be expected.
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Societies and Academies. Nature 134, 862–863 (1934). https://doi.org/10.1038/134862b0
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DOI: https://doi.org/10.1038/134862b0