Many of the volcanic rocks are shades of red in colour and were deposited subaerially. The predominantly volcanic Takla Group contains some fossiliferous sedimentary units. The pelecypod Halobia has been recovered from outcrops of these rocks near Perow and northwest of Granisle. Permian limestones also outcrop on the lower Fulton River, above the fish hatchery. H.W.Tipper, T.A.Richards, T.P.Poulton, S.Duffell, J.G.Souther, K.N.Bassett, K.L.Kleinspehn, G.D.Stanley, C.A.Roberts, and C.J.Yorath.
References are available upon request.