The Martisco series consists of very deep, very poorly drained soils formed in a thin mantle of well decomposed organic deposits overlying marl. The organic layers are 8 to 16 inches thick. These soils are in low nearly level area on outwash terraces and plains, flood plains, lacustrine plains, and in upland depressions or seeps.
Flooding is frequent in some areas.
Slope ranges from 0 to 2 percent. Mean annual temperature is 49 degrees F. and mean annual precipitation is 38 inches. Martisco muck, on a less than 1 percent slope in a wooded area. Thickness of the organic surface layer ranges from 8 to 16 inches over marl. Depth to bedrock is greater than 60 inches.