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Custom Soil Resource Report <br />form either soft masses or hard concretions or nodules. Movement of iron and <br />manganese as a result of redoximorphic processes in a soil may result in <br />redoximorphic features that are defined as follows: <br />1. Redoximorphic concentrations. —These are zones of apparent accumulation <br />of iron -manganese oxides, including: <br />A. Nodules and concretions, which are cemented bodies that can be <br />removed from the soil intact. Concretions are distinguished from nodules <br />on the basis of internal organization. A concretion typically has <br />concentric layers that are visible to the naked eye. Nodules do not have <br />visible organized internal structure; and <br />B. Masses, which are noncemented concentrations of substances within <br />the soil matrix; and <br />C. Pore linings, i.e., zones of accumulation along pores that may be either <br />coatings on pore surfaces or impregnations from the matrix adjacent to <br />the pores. <br />2. Redoximorphic depletions. —These are zones of low chroma (chromas less <br />than those in the matrix) where either iron -manganese oxides alone or both <br />iron -manganese oxides and clay have been stripped out, including: <br />A. Iron depletions, i.e., zones that contain low amounts of iron and <br />manganese oxides but have a clay content similar to that of the adjacent <br />matrix; and <br />B. Clay depletions, i.e., zones that contain low amounts of iron, <br />manganese, and clay (often referred to as silt coatings or skeletans). <br />3. Reduced matrix. —This is a soil matrix that has low chroma in situ but <br />undergoes a change in hue or chroma within 30 minutes after the soil material <br />has been exposed to air. <br />Reduced matrix <br />See Redoximorphic features. <br />Regolith <br />All unconsolidated earth materials above the solid bedrock. It includes material <br />weathered in place from all kinds of bedrock and alluvial, glacial, eolian, lacustrine, <br />and pyroclastic deposits. <br />Relief <br />The relative difference in elevation between the upland summits and the lowlands <br />or valleys of a given region. <br />Residuum (residual soil material) <br />Rill <br />Unconsolidated, weathered or partly weathered mineral material that <br />accumulated as bedrock disintegrated in place. <br />Avery small, steep -sided channel resulting from erosion and cut in unconsolidated <br />materials by concentrated but intermittent flow of water. A rill generally is not an <br />obstacle to wheeled vehicles and is shallow enough to be smoothed over by <br />ordinary tillage. <br />47 <br />