Steeply sloping west facing scarp of the Greenmoor Rock (OS GSGB sheet 100) which forms the historic boundary between Ecclesfield and Bradfield parishes. It is likely to tend naturally to woodland due to its sloping nature and marginal position between two parishes. The area is shown as rough ground on the 1851 OS 6 inch data and is currently regenerating as scrub. The boundary has been marked since at least 1161 by the 'Birley Stone' (SMR PRN169 and Hunter 1869, 41). Fragmentary legibility of ancient boundary.