The soil inventory survey of Wallace County, Southland was mapped at 1:50,000 scale and covers approximately 700,000 hectares of a total of 965,600 hecatres. Within 6 physiographic regions, soils have been separated by differences in morphology, drainage and parent materials into 132 soil mapping units. Soils have been correlated to South Island soil sets and classification of soils for land use are provided in the attribute table.
Soils in this area were previously described in Soils of Southwest Southland (Wright, 1951), and in the General Survey of the Soils of the South Island (Soil Bureau Bulletin 27, 1968). Soils were examined in pits, cuttings and auger borings, and boundaries were manually plotted in the field on aerial photographs (stereo pairs at 1:15,840 scale) and transferred to a topographic base map at 1:63,360 scale.
The soils information for lowland areas in this survey has been superceded by Topoclimate South (1998-2001) and then by S-map (2014).