The book Principles of Stratigraphy was written by author Grabau, Amadeus W. (Amadeus William), 1870-1946 Here you can read free online of Principles of Stratigraphy book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Principles of Stratigraphy a good or bad book?
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05 he calls coarse silt, from 0. 05 to 0. 025 medium silt, from the last to 0. 005 mm. Fine silt, and below that to o. Ooi mm. Colloidal clay. Orth, Laufer, etc. , call 0. 05 to o. Oi mm. Dust, and everything below that finest dust. Wollny calls fragments from 5 to 2 mm. Medium gravel, from 10 to 5 coarse gravel and above 10 mm. Stones. Thoulet has given these dimensions, gravel: coarse, 9. 0 mm. ; medium 4. 5 mm. ; fine 3. 0 mm. ; sand: coarse (a) 1. 32 mm. , (b) 0. 89; medium (a) 0. 67, (b) 0.... 54, (c) 0. 45 ; fine (a) 0. 39, (b) 0. 34, (c) 0. 30, (d) 0. 26 mm. ; very fine 0. 04 mm. Silt below 0. 04 mm. * It will be seen that Crosby and Thoulet differ most from the others, and also from each other. Their definite sizes are less sat- isfactory than the ranges given by the others. F Types of Sands Based on Origin. Sherzer (26) has recently proposed to subdivide sands according to their mode of origin into 7 groups, each with a number of sub- groups. They are herewith given, separated into clastic and non- clastic sands, and each is referred to its proper place in the classifi- cation adopted in this book.
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