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CASTEN DYKE SOUTH

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A linear boundary earthwork, which has widely been accepted as being a prehistoric dyke, associated with Casten Dyke North (UID 57368), the Cleave Dyke (UID 1032865), and the early Iron Age promontory fort at Roulston Scar (UID 57324), has been reinterpretated as being of medieval date. The boundary runs in a straight line from W to E. Over a distance of 260m at its W end, it survives in reasonable condition as an earthwork (Scheduled). The W terminus is the side of a steep-sided valley, Boar's Gill; a post medieval limestone quarry (UID 1526097) located here has potentially destroyed elements of the monument. The E end of the monument, which has been ploughed away but is clearly visible on early aerial photographs, extended for a further c200m to the head of another ravine, Hell Hole. The last few metres of the ditch may survive, although is is difficult to distinguish the artificial earthwork from erosion. The boundary would thus have cut off a block of landscape to the S, the southern edge of which is defined by the S escarpment of the Hambleton Hills. However, it seems likely on the evidence of both the form and plan relationship of Casten Dyke South that it is a later addition, probably of medieval date. The linear earthwork was reused as a field boundary into the 20th century. This feature ws mapped as part of the North York Moors National Park NMP, visible as earthworks on air photographs. The monument appears to be largely extant on the latest 2009 vertical photography.

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