Cropmarks of a possible enclosure of unknown date, at Thornbury Hill, Hagworthingham. Visible as a regular, curvilinear cropmark with two straight sides, defined by a single ditch measuring 30m by 10m. Identified on aerial photography examined as part of the National Mapping Programme. An explanation of the cropmarks as being the remains of a former long barrow has been suggested. {1}{2} The interpretation of this feature as a long barrow has been questioned by Dilwyn Jones, during re-analysis of the aerial photographic evidence. An explanation of the cropmarks as being the remains of a former extractive pit of likely post-medieval date is thought much more likely. The 1st edition 6" Ordnance Survey County Series map also shows a former quarry pit in this location, with the pit's dimensions closely matching that of the cropmark. {3}{4}{5}