Further reliques of Constance Naden : being Essays and tracts for our times / edited, with an naalytical and critical introduction, and notes, by George MMcCrie . Thus an over-fault (2) is the final stage of an over-fold (1).In the shearing plane (a b) the beds are rolled out, inter-mixed, and twisted, as though in a mill. Foliation is thusproduced, and the more fluid constituents of the rock are insome cases squeezed out, and crystallize between the laminaeof more solid materials. Thus a set of rocks of very variedcomposition may be transformed into an apparently homo-geneous sheet of enormou
Further reliques of Constance Naden : being Essays and tracts for our times / edited, with an naalytical and critical introduction, and notes, by George MMcCrie . Thus an over-fault (2) is the final stage of an over-fold (1).In the shearing plane (a b) the beds are rolled out, inter-mixed, and twisted, as though in a mill. Foliation is thusproduced, and the more fluid constituents of the rock are insome cases squeezed out, and crystallize between the laminaeof more solid materials. Thus a set of rocks of very variedcomposition may be transformed into an apparently homo-geneous sheet of enormous thickness. This seems the mostprobable mode of origin of Archaean rocks. Some aredoubtless pre-Cambrian, while others are certainly newer;but petrologically, the two classes are indistinguishable. TYPICAL DEVELOPMENT OF AECHAEANS IN BEITAIN. The whole of Scotland, north of a line drawn from Glas-gow to Stonehaven, is paved with gneisses and schists, andslates here and there. They contain vast dykes of pegmatiteand gabbro, and veins of marble. In Caniop and Assynt thegneisses are covered by the Torridon sandstone, which under-lies a system of quartzites a
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