The Tendoy series consists of very deep, very poorly drained organic soils that formed in material derived from herbaceous plants.
Permeability is moderate.
These soils are on floodplains and have slopes of 0 to 1 percent. Tendoy muck - on a nearly level floodplain under sedge and grass vegetation at 4,690 feet elevation. Lupton soils contain up to 30 percent woody fragments and lack calcium carbonate in the upper part of the surface tier. Pywell soils have thin layers of volcanic ash, contain up to 35 percent woody material, and lack calcium carbonate in the upper part of the surface tier. Seeleyville soils lack calcium carbonate in the upper part of the surface tier.