Remains of a prehistoric enclosure, to the north-west of South Ormsby. The feature was noted during a geophysical survey, conducted in 2018 as part of an investigation of nearby long barrows. It was identified as a C-shaped ditched feature, orientated east to west and measuring 10m by 2.9m internally, with a 1.4m wide ditch. The enclsoure was included in the scheduling for the group of three nearby long barrows (see MLI43651, MLI126959 and MLI126960) and an adjacent round barrow (see MLI82256). All of the features here lie below the crest of the hill south of Bluestone Heath Road, and north of the valley of a small brook which eventually joins Calceby Beck. Valuable archaeological deposits will be preserved on the buried ground surface and in the fills of the ditches. These will provide rare information concerning the dating and construction of the monument and the sequence of mortuary practices at the site. The same deposits will also retain environmental evidence illustrating the nature of the landscape in which the monuments were set. The three long barrows, one round barrow and C-shaped ditched enclosure form a group. They are all situated within 90m of each other and demonstrate that there was considerable activity in this location in the Neolithic and Bronze Age period. They also form part of the wider significant group of long barrows in the Lincolnshire Wolds. {1}