In some areas, a low pH is an additional requirement. When conditions are suitable to maintain an anaerobic situation, plant remains are converted into a formless black mass. Overtime, more of the decomposed plant remains accumulated. The black color changes to brown and later to light brown. A large percentage of the organic soils in the United States were formed in Lakes and river beds following glacial action.
Glacial action is the most important causal agent in the development of organic soils.
Organic soils formed in glacial beds, small depressions and low areas. Relatively large continuous areas were formed as a result of filling in on a shallow lake. Pattern formed from tilting of the earth surface-Tilting of the land surface closed to the earth outlet. From site pictures collection taken by Pendu Duku. Organic Soils are highly compressible and nonhomogeneous.