SOIL SURVEY

-141 -EnvironmentThe Watchtower soilscape group generally occurs on well drained valle ybottom sites within the montane vegetative zone . A small number of Watchtowe rmap unitsare however, scattered throughout the subalpine vegetative zone .Table 52 . Key criteria differentiating the Watchtower map units .Soi IscapeMap Unit ClassificationWR 1WR 2Orthic & CumulicRegosol sCumulic & Orthi cRegosol sTexturegravelly sandyloam to gravelly 20-50%loamy sandgravelly loam togravelly sandy loa mCoarse Fragment Drainag eContent (%) Class> 40%well torapidlywell t orapidl yWR 3Orthic & Cumuli cRegosol ssilt loam < 20%gravelly sandy loam 20-50 %wel lWR4Gleyed Orthic andGleyed Cumuli cRegosol ssilt loam < 20%imperfectl yWR 5Gleyed OrthicRegosolsgravelly fine sand yloam to gravelly 20-50%silt loamimperfectl yWR 1 Map Unit (Orthic and Cumulic Regosols )This map unit h characterized by gravelly and very gravelly soils with littl ehorizon development, formed on coarse textured, calcareous fan alluvium . An A hhorizon is not present in these soils . Coarse fragments are gravel and cobble sizedand may exceed 50% on some fans or portions of some fans . These soils are usuall yexceedingly stony .