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TA5 <br />BASELINE SURVEY OF SOIL RESOURCES <br />COLLUM MINING AREA <br />MAP UNIT DESCRIPTIONS <br /> <br /> <br />Map Unit Slope-Pct. Components % Surf Text Topsoil Subsoil Limiting Factors Inclusions Comment <br /> Danavore 40 Loam 3 10 Some thin loess deposits creating <br />Some thi <br />lo Steep slopes, minimal profile development. Most <br />F36 25-60 High rock content at depth n <br />yolls. of the argillic horizons are weak and border on <br /> Ustic Haplocryalfs/Haplocryepts 40 Loam 3 10 Iambic (Haplocryepts). <br /> <br />37 <br />0-25 Danavore 40 Loam 3 10 <br />Hi <br />h rock/shale content at de <br />th Areas with thinner or no loess may develop Ridge tops with some loess accumulation, but <br />man <br />wind swe <br />t areas <br />O <br />ortunities for s <br />it <br />bl <br /> g <br />p Cryalfs y <br />p <br />. <br />pp <br />u <br />a <br />e <br /> Thornburgh 40 Loam 10 10 salvage are highly variable. <br /> Wa be 50 Clay 8 0 High clay content Torri <br />th <br />t <br />t <br />li <br />it <br />t <br />th <br />il <br />d <br />t Rid <br />T <br />s and <br />er slo <br />th <br />th <br />d <br /> <br />38 <br />0-35 <br />Hi <br />h <br />k <br />d <br />l <br />t <br />t en <br />s occur <br />m <br />en <br />, o <br />or <br />o a <br />e <br />ex <br />er so <br />s upp <br />pes on <br />ge <br />op <br />e sou <br />en <br />. <br /> <br />Other Haplocryepts <br />35 <br />Loam <br />15 <br />0 g <br />roc <br />an <br />c <br />ay con <br />en <br />- <br />are similar to primary components. <br />Very little, if any, subsoil. <br /> bedrock. <br /> This unit occurs to a very limited extent in as cryic <br /> <br />39 <br />10-25 <br />Loamy-Skeletal Ustic Haplocryept <br />70 Gravelly- <br />4 <br />15 Weak profile development and Eutrocryalfs and similar Mollisols (Thornburgh) are alluvial deposits with materials originating from <br /> Loam high rock content at depth. present in this unit. bare Haplocryept/Torriorthent slopes in the <br /> southern portions of Collom Gulch. <br /> Thornburgh 50 Loam 14 10 <br /> Deeper pockets of loess and areas where <br />40 0-20 <br />Lithic Haplocryolls (Duffymont High rock content or bedrock at <br />sandstone is deeper in the profile yield Skyway v. Unit occurs on ridge tops with sandstone layers <br /> <br />similar) 35 Loam 6 6 shallow depth. <br />and other similar soils. Few rock outcrops present. buried by loess or weathered to shallow depths. <br /> Argillic horizons (Cryalf/Argicryolls) occur where <br /> shale is more prevalent in the colluvium. Where On slopes that are not directly windward on the <br /> Gravelly-L & Higher rock orclay/shale below the shale colluvium is buried deep with some south end. Further north, this unit occurs on the <br />41 10-60 Thornburgh 65 Loam 10 10 20 inches. illuvial clay they could potentially be classified as north facing slope of east-west drainages where <br /> Palecryolls (Northwater). Some pockets of loess loess is deposited in thin layers over colluvium. <br /> create Pachic soils (Rhone v./Cochetopa). <br /> Occasional rock outcrop (<10%). <br /> More clay, less nutrients with Some less developed (Havre and similar) and This map unit occurs on the terraces and outwash <br />42 0-10 Adderton 75 Clay Loam 15 20 depth. more developed (Rhone and similar) soils are slopes of the upper Collom Gulch and Lower <br /> present. Wilson drainages. <br /> High rock content and bedrock Some shallower (lithic) and deeper (Lamphier) This unit occurs on slopes with shallow loess <br />43 10-25 Skyway 75 Loam 18 6 at depth. soils are present to a limited extent. accumulation over sandstone colluvium and <br /> bedrock. <br /> Very deep soils formed from accumulations of <br /> aeolian deposits. This unit occurs in the swales <br />44 0-35 Lamphier 90 Loam & Silt 20 25 Low nutrients and higher clay. Some more skeletal and shallower components and headwaters in the southern portion of the <br /> Loam (Rhone v.). study area. Soil below 45 inches is often be very <br /> good plant growth material, especially near the <br /> center of swales and drainage bottoms. <br /> Low nutrients and less This unit has the deepest profiles in the study <br /> Loam & Silt development, although most of Cumulic Haplocryolls may be present but may be area. Organic matter is present in the soil beyond <br />" <br />45 0-20 Lamphier 90 Loam 20 30 the unit has suitable soil beyond only finely distinguished from Lamphier. 60 <br />with very few limiting factors. The proposed <br /> 60 inches. salvage depths take the best of the material in <br /> which most of the roots were found. <br /> Low nutrients and higher <br /> Lamphier 45 Loam (relative) coarse fragments and Some skeletal profiles and pedons with argillic Similar to headwaters Lamphier unit, but with <br />46 10-50 18 15 clay at depth. <br />t li <br />iti <br />h <br />i <br />t <br />b <br />t more coarse fragments and shallower depth to <br /> Rhone v. <br />35 <br />Loam High coarse fragments and clay m <br />or <br />zons are presen <br />, <br />u <br />no <br />ng. bedrock. <br /> Fine-Loam /Loam -Skeletal at depth. <br />N:\TYPING\ENV-FAC\5520068\Collum Soil Data\Table B-5 Page 5 of 7