Physical Features of the Des Plaines Valley
Physical Features of the Des Plaines Valley
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In our eReader you can find the full English version of the book. Read Physical Features of the Des Plaines Valley Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Physical Features of the Des Plaines Valley
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— The appearance of a strongly glaciated surface of rock is so characteristic that it deserves more than mention. The drift-shod ice, moving slowly along over the rock floor and pressing down upon it with tremendous weight, rasps 30 THE DES PLAINES VALLEY. [bull. No. Li and scours it. The finely comminuted clay or ''rock flour" which makes up a large part of the drift, probably lubricated with water, smooths and even polishes the rock surface. Coarser particles in the ice such as sharp cornered... bits of rock, are held firmly against the bed rock like en- graving tools, scratching the surface more or less deeply in the direction of glacier motion, until the cutting edge is blunted or the pebble turns around. Tiicse scratches or "strije, " where best formed (on rock of fine grain, dense texture, but of relatively slight hardness, like certain layers of the Niagara limestone) begin abruptly and gradually narrow or tail out in the direction in which the glacier advanced. They vary in size from scratches of a hair's breadth to grooves several inches in cross sec- tion.
What to read after Physical Features of the Des Plaines Valley?
You can find similar books in the "Read Also" column, or choose other free books by James Walter Goldthwait to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
— The appearance of a strongly glaciated surface of rock is so characteristic that it deserves more than mention. The drift-shod ice, moving slowly along over the rock floor and pressing down upon it with tremendous weight, rasps 30 THE DES PLAINES VALLEY. [bull. No. Li and scours it. The finely comminuted clay or ''rock flour" which makes up a large part of the drift, probably lubricated with water, smooths and even polishes the rock surface. Coarser particles in the ice such as sharp cornered... bits of rock, are held firmly against the bed rock like en- graving tools, scratching the surface more or less deeply in the direction of glacier motion, until the cutting edge is blunted or the pebble turns around. Tiicse scratches or "strije, " where best formed (on rock of fine grain, dense texture, but of relatively slight hardness, like certain layers of the Niagara limestone) begin abruptly and gradually narrow or tail out in the direction in which the glacier advanced. They vary in size from scratches of a hair's breadth to grooves several inches in cross sec- tion.
What to read after Physical Features of the Des Plaines Valley?
You can find similar books in the "Read Also" column, or choose other free books by James Walter Goldthwait to read onlineMoreLess
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