The book A Treatise On Rocks, Rock-Weathering And Soils; was written by author George P George Perkins Merrill Here you can read free online of A Treatise On Rocks, Rock-Weathering And Soils; book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Treatise On Rocks, Rock-Weathering And Soils; a good or bad book?
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IX, 1889, p, 530. VOLCANIC TUFFS 141 at times so highly metamorphosed as to render the original nature of some doubt. Certain English authorities have con- tended that a part of the so-called argillites and lire clays were of finely comminuted volcanic materials. The composition of the tuffs naturally varies with that of the character of the lava from which they were derived. Being in a more or less finely comminuted condition, often porous and readily permeated by water or rootlets, they under...go de- composition, forming soils the character of which is dependent to some extent upon their lithological nature. The following table shows the varying composition of rocks of this class : o" "S, *- - s o KINDS AND LOCALITIES 33 15 & ! S C3 r , | X 1 IS |S s te 1 ^0 42 o | JS * 3 O 02 *
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