SOIL SURVEY
SOIL SURVEY SOIL SURVEY
-122-SI -Silverslope Soilscape Grou pPhysiographic SettingSILVERSLOP ESOIISCAPESI 11 SI2 ~ T. 7/r 0- /Z_COLLUVIU M1 4,74:: BEDROCKFigure 84 . Sketch showing the landscape relationships between Silverslope andassociated soilscape groups .Landform and Parent Material sThe Silverslope soilscape group occurs on residual and colluvial slopes . Theparent materials are usually calcareous and range from medium to coarse textured .Shallow materials (lithic) of undifferentiated (till, colluvium,residual) origin ar ealso included within this map concept .EnvironmentThe Silverslope soilscape group occurs in the upper part of the subalpin evegetative zone at elevations of about 2000 to 2150 m a .s.l . This zone is referredto as the upper subalpine ecotone and has a relatively open (< 30%) forest cover .
-123-Table 44 . Key criteria differentiating the Silverslope map units .Soi Iscap eMap UnitClassificationTextureCoarse Fragment Drainag eContent (%) ClassS1 1Orthic Humo-Ferric andFerro-Humic Podzolssilt loam tosandy loa m< 50% wel lSI2Lithic Orthic Humo-Ferric Podzolssilt loam to sandyloam over bedrock< 50% wel lSI1 Map Unit (Orthic Humo-Ferric and Ferro-Humic Podzols )This map unit is characterized by non-lithic soils which are developed o ncolluvium within the upper subalpine ecotone . A turfy Ah horizon is often, but notalways present . Snowchute areas which occur within the upper subalpine ecoton eare generally mapped as S1 1A .Table 45 . Brief description of the pedon chosen to characterize the SI 1 map unit .HorizonDepth(cm)moist colorAh 0-6 very dark brown 45Est . Coars eFragments(%)Textur egravellysilt loa mAe trace light gray to gray - fine sandy loamBhf 6-21strong brown and10 silt loamdark yellowish brownBm 21-38 yellowish brown 50very gravell ysandy loamvery gravellyCkl 38-85 pale olive 90 coars esandy loa mCk2 85-95+ pale olive 40-50 gravelly loa mp H(CaC I2)Organi cMatter(%)4 .5 22- -5 .0 8 . 85 .0 1 . 65 .2 -6 .0 -Orthic Ferro-Humic Podzo lThe steep slopes and severe climate which are associated with this map uni tsuggest that it has severe and very severe limitations for most recreational an dengineering uses .
- Page 89 and 90: Figure 37 . Site of the pedon chose
- Page 91 and 92: -73-Landform and Parent Material sT
- Page 93 and 94: -75-The silty surface texture, slow
- Page 95 and 96: -77-material and/or shallowness (of
- Page 97 and 98: Figure 44 . Site of the pedon chose
- Page 99 and 100: -81-HR1 Map Unit (Degraded Eutric B
- Page 101 and 102: -83-in the solum, but may exceed 50
- Page 103 and 104: -85-KI - Kicking Horse Soilscape Gr
- Page 105 and 106: -87-Silty surficial textures provid
- Page 107 and 108: -89-Wetness, texture, and potential
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- Page 119 and 120: -101 -EnvironmentThe Ogden soilscap
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- Page 125 and 126: -107-Figure 70 . Site of the pedon
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- Page 137 and 138: -119-OT - Otterhead Soi Iscape Grou
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- Page 145 and 146: -127-Landform and Parent Material s
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- Page 149 and 150: Figure 91 . Site of the pedon chose
- Page 151 and 152: -133-Environmen tzones .The Tocher
- Page 153 and 154: -135--The steep slopes and the rela
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- Page 157 and 158: Figure 97 .Site of the pedon chosen
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- Page 163: -145-The stoniness and periodic sno
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- Page 168 and 169: -150-late snowmelt areas or streams
- Page 170 and 171: -152-The soils have been rated acco
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- Page 180 and 181: -162-Table 66 . Frost design soil c
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- Page 188 and 189: -170-GLOSSARY'AASHO classification
-123-Table 44 . Key criteria differentiating the Silverslope map units .Soi Iscap eMap UnitClassificationTextureCoarse Fragment Drainag eContent (%) ClassS1 1Orthic Humo-Ferric andFerro-Humic Podzolssilt loam tosandy loa m< 50% wel lSI2Lithic Orthic Humo-Ferric Podzolssilt loam to sandyloam over bedrock< 50% wel lSI1 Map Unit (Orthic Humo-Ferric and Ferro-Humic Podzols )This map unit is characterized by non-lithic soils which are developed o ncolluvium within the upper subalpine ecotone . A turfy Ah horizon is often, but notalways present . Snowchute areas which occur within the upper subalpine ecoton eare generally mapped as S1 1A .Table 45 . Brief description of the pedon chosen to characterize the SI 1 map unit .HorizonDepth(cm)moist colorAh 0-6 very dark brown 45Est . Coars eFragments(%)Textur egravellysilt loa mAe trace light gray to gray - fine sandy loamBhf 6-21strong brown and10 silt loamdark yellowish brownBm 21-38 yellowish brown 50very gravell ysandy loamvery gravellyCkl 38-85 pale olive 90 coars esandy loa mCk2 85-95+ pale olive 40-50 gravelly loa mp H(CaC I2)Organi cMatter(%)4 .5 22- -5 .0 8 . 85 .0 1 . 65 .2 -6 .0 -Orthic Ferro-Humic Podzo lThe steep slopes and severe climate which are associated with this map uni tsuggest that it has severe and very severe limitations for most recreational an dengineering uses .
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