The limestone hills of the Kinta Valley are remnants of extensive limestone beds, which are part of a Paleozoic carbonate complex that covered large parts of South-East Asia and south China. The original limestone beds of the Kinta Valley, presumed to be Carboniferous (Ingham & Bradford, 1960; Hutchison, 2007) or possibly Permian in age (Fontaine, 1995), have been severely eroded and karstified (Figure 1).