Marlette soils, which are deeper to free carbonates, occur in association with Guelph in some areas. Well drained and moderately well drained. The moderately well drained phase has a seasonal high water at depths of 2.5 to 6.0 below the surface from December to April. Surface runoff is medium to very rapid depending on slope. Permeability is moderately slow.
Most areas are under cultivation.
Corn, beans, wheat, and grass-legume hay are the principal crops. The more sloping areas are generally pasture or hardwood forest. Thumb area of Michigan, northern Ohio and adjoining areas in Canada. The series is of large extent. Sanilac County, Michigan, 1955.