The ecology of the Hutt Valley: Notes on the soils of the Hutt Valley

[First paragraph...]
The soils of the Hutt Valley can be described in three groups according to their occurrence on either (1) river flats, swamps and sand dunes or (2) terrace lands or (3) moderately steep hillsides occupy approximately 80% of the district whereas the other two divisions each total about 10% of the area.