Acidic soils forming under coniferous forests and heathlands in cool, humid climates. Characterized by a thin organic O horizon, a leached E horizon, and a reddish-brown clay-rich B horizon. Common in western and northwestern uplands.
Moderately acidic soils under deciduous forests and grasslands in temperate zones. Dark organic A horizon over a brown/reddish-brown B horizon. The most widespread soil type in Ireland, found from lowlands to uplands.
Poorly drained, waterlogged soils with gray/bluish-gray color and high organic matter. Prevalent in low-lying floodplains and river valleys.
Organic soils forming in wetlands, high in organic matter, low in minerals. Common in western/northwestern uplands.
Shallow, calcareous soils on limestone bedrock. Dark organic A horizon over a white/light-gray B horizon. Found in limestone areas such as the Burren, County Clare.