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51 <br />C~ <br />• <br />Depth: In inches or centimeters fran the top of A1, or surface mi- <br />neral horizon, except for the surface of peat or muck in Bogs and <br />Half Bogs. <br />'If~ickrrss: Average thickness and range, as B(4-9) . <br />Boundary: [hrizon boundaries are described as to distinctness: <br />Abrupt-a; clear-c; gradual-g; diffuse-d; and according to top- <br />ography: Smooth-s; wavy-w; irregular-i; broken-b. An abrupt, <br />irregular boundary is ai. <br />Cnl.or: Soil colors are indicated by using the appropriate hiunsell <br />notation, such as 5YR 5/3. The spaces in the suggested notebook <br />page under color are left open, except for checking whether dry or <br />moist, in order to accamndate the small space to the need of the <br />descriptions of individual horizons. If the soil mass is one solid <br />color, only one notation is required. If the outsides of aggregates <br />differ significantly fran their interiors, both colors are needed. <br />The description of mottled soil horizons needs to include the color <br />of the matrix and the color, or colors, of the principal mottles <br />plus a description of the pattern of mottling. <br />Mottling: A description of the mottling in soil horizons requires <br />a notation of the colors and of the pattern. Colors can be given <br />in terms of the Mansell notation or in their linguistic equivalents, <br />since exact measuranent is neither possible nor necessary. The pat- <br />tern may be noted as follows: <br />Abundance; Contrast: <br />few............f faint...........f <br />camion.........c <br />many...........m <br />Size: <br />fine...........1 <br />medium.........2 <br />distinct........d <br />prcminent.......p <br />coarse.........3 <br />Thus a medium ray soil horizon mottled with yellow and reddish <br />brawn crould be noted as: lOYR 5/1, cad, lOYR 7/6 and SYR 4/4 (or) <br />lOYR 5/1, cad, yellow and reddish brawn. <br />~J <br />