SOIL SURVEY

-70-The steep slopes which are generally associated with this map unit result i nsevere and very severe limitations for many recreational and engineering uses . Whereslopes are not limiting, these soils are generally well suited for recreational uses, bu thave a moderate limitation for buildings and roads due to potential frost heaving .CO - Clawson Soilscape GroupPhysiographic Setting (Figure 99 )Members of the Clawson soilscape group occur on fans where the stream i sdeeply entrenched preventing flooding . These fans are typically larger than mos tfans in Yoho, and generally have less than 20% slopes . Positions of these fans nea rthe apex or the stream may be subject to profile disruption and thus not part of th eClawson soilscape group concept .Landform and Parent Materials .The Clawson soilscape group occurs on fluvial fans and aprons . The material sare calcareous, stratified, medium and coarse textured alluvium which generall ycontain less than 50% coarse fragments .Environmen tThe Clawson soilscape group is usually mapped on well drained sites at valle ybottoms within the montane vegetative zone, and occasionally in the subalpin evegetative zone .CO1 Map Unit (Orthic Eutric Brunisols )This map unit is characterized by soils with brownish B horizon developmen ton calcareous fan alluvium . The soils are medium to coarse textured, generally contai nless than 50% coarse fragments, and are well drained .