If you are unfamiliar with New Zealand soil orders, Hewitt (2013) provides an easy-to-read introduction. Below, the 15 NZSC soil orders are introduced in more detail.
Allophanic Soils are dominated by allophane (also imogolite or ferrihydrite) minerals.
Anthropic Soils are constructed by, or drastically disturbed, by people.
Brown Soils have a brown or yellow-brown subsoil below a dark grey-brown topsoil.
Gley Soils, together with Organic Soils, represent the original extent of New Zealand wetlands.
Granular Soils are clayey soils formed from material derived by strong weathering of volcanic rocks or ash.
Melanic Soils have black or dark grey well structured topsoils.
Organic Soils are formed in the partly decomposed remains of wetland plants (peat) or forest litter.
Oxidic Soils are clayey soils that have formed as a result of weathering over extensive periods of time in volcanic ash or dark volcanic rock.
Pallic Soils have pale coloured subsoils, due to low contents of iron oxides.
Podzol soils are strongly acid soils that usually have a bleached horizon immediately beneath the topsoil.
Pumice Soils are sandy or gravelly soils dominated by pumice, or pumice sand with a high content of natural glass.
Raw Soils are very young soils. They lack distinct topsoil development or are fluid at a shallow depth.
Recent Soils are weakly developed, showing limited signs of soil-forming processes.
Semiarid Soils are dry for most of the growing season. Rain is not sufficient to leach through the soil, so ime and salts accumulate in the lower subsoil.
Ultic Soils are strongly weathered soils that have a well-structured, clay-enriched subsoil horizon.