1. Feature portrayed as 'old level' on OS County series (1878).
J.Wiles, RCAHMW, 19.02.2004.

2. An early nineteenth-century rock cut and stone lined adit entrance of around 1840 adjacent to the Clyne Wood canal built around 1800. Situated in Clyne Valley Country Park.
(Source: Collieries of Wales, RCAHMW)
B.A.Malaws, RCAHMW, 24 May 2011.