Zurich is the moderately well and well drained member of the drainage sequence with the Aptakisic series and is the closest associate. Zurich occupies more rolling slopes in the landscape. The Del Rey soils occupy lake-bed positions in association with the Aptakisic soils and are fine textured. Somewhat poorly drained. Surface runoff is slow to medium.
Permeability is moderate.
Known extent is small. Lake County, Illinois, 1976. The Aptakisic soils would have been classified as Gray-Brown Podzolic soils.