Mollisol - mollis means soft in Latin. Dark grassland soils. Midwestern prairie soils are good examples of mollisols. Names end in oll . These are medium-aged soils that usually form under deciduous forests.
Names end in alf .
Ultisol - ult from Latin ultimus. These soils are essentially acidic counterparts of alfisols. They have argillic horizons and low base saturation. Name ends in ult . Oxisol - ox from oxide.