"This dramatic place is traditionally referred to as High Cup Nick, although rather intriguingly some old maps label it is as Eagle's Chair suggesting and eyrie probably existed here in times past. (...) The long symmetrical escarpments of dark dolerite at the rim of the valley are a result of the Whin Sill outcropping on either side of the valley. The whinstone rocks have then been eroded and weathered into columnar pillars, often producing a pleated effect in the play of light and shade." In The North Pennines - Landscape and Legend by Iain Brown.
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