Prof. M. Fall - Uniersity of OttawaProf. M. Fall - Uniersity of Ottawa3USDA system for determining soil separatesCoarse grained soilsSoil componentsGrain SizeDeterminationBoulders200 mm +Cobbles200 mm to 63 mmGravelSandCoarseMediumFine0.5 to 2 mm0.25 to 0.5 mm0.07 to 0.25 mmMesurable and barely discernable to eye63 mm to 2.4 mmMesurable and visible to eyeMesurable and visible to eyeMesurable and visible to eye2. Main soil categoriesMesurable and visible to eyeMesurable and visible to eyeFine grained soils•Silt, clays•The subdivision of fine grained soils is not based on the size of the grains but on the plascicitycriteria (chapter 4)2. Main soil categoriesGenerally, there is a mix of several soil categories, with however one dominant category)Then, in the description of the soil category, the nameof the dominant category will be used in combinationwith an adjective describing the minority categoryClayeysand (sand, majority; clay, minority)Sandysilt (silt, majority; sand, minority)
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fine grained soils, Main soil categories, Mesurable