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Updated: May 1, 2025
The fact often referred to in this chapter, of the foliation and the so- called strata in the metamorphic series, that is, the alternating masses of different varieties of gneiss, mica-schist, and hornblende-slate, etc., -being parallel to each other, at first appears quite opposed to the view, that the folia have no relation to the planes of original deposition.
Near the summit the hornblende-slate gradually becomes more and more coarsely crystallised, and less plainly laminated, until it passes into a heavy, sonorous greenstone, with a slaty conchoidal fracture; the laminae on the north and south sides near the summit dip inwards, as if this upper part had expanded or bulged outwards.
Frequently, between the granite and the hornblende-slate above- mentioned, grains of mica and crystalline feldspar appear in the schist, so that rocks resembling gneiss and mica-schist are produced. Fossils can rarely be detected in these schists, and they are more completely effaced in proportion to the more crystalline texture of the beds, and their vicinity to the granite.
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