Abstract
The views of my friends, M. de Verneuil, Count Keyserling, and myself respecting the geological structure of large portions of Russia, particularly in reference to the palæozoic succession of that country, have been already laid before the Society. In those communications allusions were made to the absence of a well-defined base line for the Silurian rocks of the Baltic and the eastern governments of the empire, owing in some instances to the interposition of arms of the sea, or great interior lakes; in others, to great masses of detritus, which occupy the surface along the boundary line ; and in others again to the prevalence of eruptive rocks, which have to a great extent metamorphosed the sedimentary masses conterminous with the crystalline rocks of Lapland.
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More From: Quarterly Journal of the Geological Society of London
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