Earthworks of probable clay extraction pits and enclosures of uncertain medieval or post-medieval date, to the south of Irby in the Marsh. Identified on aerial photography examined as part of the National Mapping Programme. {1} The former extraction pits and enclosures are clearly visible as earthworks, on the Google Maps aerial photographic layer. They are likely associated with the post-medieval brickworks site located a short distance to the south-west (see MLI126078), with the extraction pits providing clay to make the bricks. {2}