Or perhaps better known nowadays as Hasty Bank and Clay Bank Top.
Clay Bank Top is one of several low points along the Cleveland escarpment formed water overflowed from small meltwater lakes trapped between the scarp and the glacier covering the Cleveland plain and the Vale of Mowbray. Water flowed down Bilsdale and Ryedale into the western end of proglacial Lake Pickering.
It was 70 years ago today that the National Parks and Access to the Countryside Act (1949) received Royal Assent. Introduced by the Liberal politician Sir Arthur Lawrence Hobhouse, it was under this Act, The North York Moors National Park was established in 1952.