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50 <br /> coatings on particles, darker or redder colors. <br /> C - Mineral horizon lacking development, processes comnon to <br /> A and B horizons and generally little weathered but has some <br /> modifications such as accumulation of calcium carbonate, gypsum <br /> salts and some degree of weathering of underlying bedrock or other <br /> parent soil material. <br /> D - sometimes used to designate relatively unconsolidated, <br /> little-weathered materials. <br /> R - consolidated b0drock underlying soil. <br />