Any ancient land surface buried and undisturbed under a structure or within a deposit, such as peat. Buried soil reflects the nature of the soil, at least at a very local level, at the time the structure was erected or the natural deposit laid down. Buried soil may be analyzed for faunal, insect, molluscan, and pollen remains which would give information about the environment of the period. Such soils are frequently preserved under barrows, mounds, or ramparts, or buried within the fill of a ditch.