SOILMARK

UF Ap Enclosure
Ap Linear Feature
Ap Macula
Ap Site
Soil Mark
SN Monument visible, usually from the air, due to the fill of features being of a different colour than the surrounding subsoil. Soilmarks show up well in ploughed fields or areas where the topsoil has been stripped. Term derived from AN32 Glossary
CL EVIDENCE
BT PHYSICAL EVIDENCE