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O
dominated by organic soil material as opposed to mineral
A
surface mineral horizon characterized by a dark color due to OM
E
light colored mineral horizons that are dominated by removal of materials by leaching
B
subsurface mineral horizons of alteration
C
unconsolidated layers of parent material that has not been significantly altered
R
hard bedrock underlying soils
p
used with A, layer has been plowed
b
used with B, illuvial accumulation of clay
k
accumulation of calcium carbonate
r
C layers that were once R