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Custom Soil Resource Report <br /> 1. Redoximorphic concentrations.—These are zones of apparent <br /> accumulation 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 <br /> nodules on the basis of internal organization. A concretion typically <br /> has concentric layers that are visible to the naked eye. Nodules do not <br /> have 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 <br /> either coatings on pore surfaces or impregnations from the matrix <br /> adjacent to 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 <br /> adjacent 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 <br /> material 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, <br /> Iacustrine, and pyroclastic deposits. <br /> Relief <br /> The relative difference in elevation between the upland summits and the <br /> lowlands or valleys of a given region. <br /> Residuum (residual soil material) <br /> Unconsolidated, weathered or partly weathered mineral material that <br /> accumulated as bedrock disintegrated in place. <br /> Rill <br /> A very small, steep-sided channel resulting from erosion and cut in <br /> unconsolidated materials by concentrated but intermittent flow of water. A rill <br /> generally is not an obstacle to wheeled vehicles and is shallow enough to be <br /> smoothed over by ordinary tillage. <br /> 61 <br />