is usually bound by a lake or something of the sorts, often resembling a banjo. They are not strongly understood or dated; however, it is evident they were originated during the Iron Age. The use of these enclosures is speculated to be for stock control and containment, rather than being for defensive and military use. It is also thought that the enclosures may have served as high-status occupation sites. The majority of Banjo enclosures are discovered through aerial photography and ground-penetrating radar imaging. Due to their earthwork, they are not expected to remain stable over time. References Types of monuments and memorials Archaeological features