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fieldstone
Fieldstone is a building construction material. Strictly speaking, it is stone collected from the surface of fields where it occurs naturally. Collections of fieldstones which have been removed from arable land or pasture to allow for more effective agriculture are called clearance cairns.
In practice, fieldstone is any architectural stone used in its natural shape and can be applied to stones recovered from the topsoil or subsoil. Although fieldstone is generally used to describe such material when used for exterior walls, it has come to include its use in other ways including garden features and interiors. It is sometimes cut or split for use in architecture.
==Deposition==
Fieldstone is common in soils throughout temperate latitudes to due glacial deposition. In Canada and the northern United States, the advance of the Laurentide ice sheet pulverized bedrock, and its retreat deposited several dozen meters of unsorted till in previously glaciated areas as far south as New England and the Upper Midwest. Although a coarse layer of glacial ablation would settle on top of the deeper lodgment till, it was these more deeply set stones that would prove a persistent challenge settled human agriculture because they would be frost-churned into surface soils during harsh winters.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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