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OL and OH Groups. These groups comprise organic silts and clays. The soils are <br />characterized by the presence of organic odor and/or dark color. The OL and OH soils <br />are differentiated by determining and comparing their liquid limit values before and after <br />oven drying representative soil samples. <br />HIGHLY ORGANIC SOILS <br />The highly organic soils are usually very soft and compressible and have undesirable <br />construction characteristics. Particles of leaves, grasses, branches, or other fibrous <br />vegetative matter are common components of these soils. They are not subdivided and <br />are classified into one group with the symbol PT. Peat humus and swamp soils with a <br />highly organic texture are typical soils of the group. <br />