Abstract
THE most important constituent of the earth's crust—the crystalline schists—has remained, with respect to their field-relations and their origin, the most shrouded in darkness. The difficulties that bar the way are quite exceptional. We have frequently to deal with rocks that have undergone subsequent alteration, without being able to determine their original constitution, and without being able to explain the nature of the change. We have, as it were, to deal with an equation with two unknowns—we cannot solve it.
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On the Classification of the Crystalline Schists 1 . Nature 38, 524–525 (1888). https://doi.org/10.1038/038524a0
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DOI: https://doi.org/10.1038/038524a0