They are characterised by their proximity to other ancient features such as enclosures, sunken lanes and farmsteads and are divided into a patchwork quilt of square plots rarely more than 2,000 m² in area although larger examples are known. Their small size implies that each was cultivated by one individual of family. Similar examples are known in Scandinavia and the Netherlands.
Lynchets, evidence of early ploughing can often be seen at the upper and lower ends. Large scale Roman agriculture replaced them in lowland Britain and they are more common in less accessible regions such as the West Country.