Biennial Report - State Geological Survey of North Dakota, Issue 4

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The Survey, 1906 - Geology
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Page 40 - of time, and so on. The sizing may be done in upward moving currents of water, of different velocities, similar to the classifier used in ore sizing. The best way is by the centrifugal method, which is employed by the Bureau of Soils of the United States Department of Agriculture 1 in analyzing soils. This
Page 30 - burn buff, even if they contain considerable iron. Ries states that the bleaching effect is most marked when the percentage of lime is three times that of iron. The formation of the easily fusible silicates also causes the clay to soften rapidly, bringing the
Page 24 - and 35 per cent. Free silica was not determined as such in the analysis of North Dakota clays. Ries 4 gives the variation of total silica in several classes of clays, the results being determined from several hundred analyses: Per cent, of total silica. Minimum.
Page 212 - could be mixed with the clav above which is much like it and would then probably make drain and sewer pipe and a good ornamental building material. An analysis of this clay shows: ANALYSIS OF LARAMIE CLAY FROM BISMARCK. Per Cent. Silica 58.73 Alumina 14.98 Iron oxide 5.63 Lime 2.10 Magnesia 0.74 Potash
Page 83 - Lignite seam with some coaly shale 10. Gray clay shale 9. Lignite seam and brown, carbonaceous clay 8. Gray, sandy clay, stained yellow in spots by iron oxide. Contains very many sandy, ferruginous nodules, distributed mostly in bands. , The nodules stand out on the surface and fragments of them cover the
Page 81 - Lignite seam 1 to 18 18. Chocolate brown clay shale, with carbonized wood.... 1 17. Bluish gray clay 10 16. Gray sand, cemented in places into soft sandstone.... 12 15. Not well exposed, but probably clay shale 50 14. Lignite seam 2 13. Gray sandy clay 32 12. Gray clay shale with no sand 2 11. Lignite
Page 179 - per ct. The bricklets, except the one burned to cone 01, were not very strong. The clay was incipiently fused at cone 1, became rapidly vitrified at cone 3, and viscous at cone 4. The following is an analysis of the same clay from the Alsip yard in the northwestern part of the city limits, formerly worked
Page 83 - Also contains large sandstone concretions and lenses 7. Gray and yellow argillaceous sand 6. Gray clay, with no sand, and containing nodules of iron oxide 5. Lignite seam 4. Gray clay shale 3. Lignite seam, entire thickness not exposed, but at least 2. Sandy clay shale
Page 83 - growing sandy above 27. Gray, sandy clay with ferruginous nodules and yellow limonitic bands 26. Clay shale,, gray and yellow in alternating layers, with thin, yellow, limonitic bands. Contains many Unios and gastropods including Viviparus
Page 290 - is first prepared by tempering over night in a soak pit. and in a short, vertical pug mill. The brick are dried in open yards and burned in scove kilns with wood fuel. They are red and porous but quite strong. The above plants are only in operation in the summer season, usually about four months.

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