In the twentieth century English Heritage identified two sections of ground on Flamborough Rigg and Pickering Moor as extensions of the Wheeldale structure and sections near Keys Beck are reported to be visible in aerial photography from 1946.
In the twentieth century English Heritage identified two sections of ground on Flamborough Rigg and Pickering Moor as extensions of the Wheeldale structure. Hayes states that the Flamborough Rigg section remained "clearly visible" as late as 1961, and that additional sections near Keys Beck were visible in aerial photography from 1946.