On the eastern boundary of the Buttle Lake uplift a band of Permian limestone of the Azure Lake Formation (formerly Buttle Lake Formation) extends for 11 kilometres along the east side of Buttle Lake, near its south end. The Buttle Lake occurrence limestone band is unconformably overlain to the east by basaltic flows of the Upper Triassic Vancouver Group, Karmutsen Formation. Underlying volcanic breccia, tuff and argillite outcrop to the west. The band is underlain near its south end by a gabbro sill.

The unit dips gently northeast to southeast. Several faults segment the limestone. A sample from a small quarry on the east shore of Buttle Lake, 22.4 kilometres south of the Gold River road bridge, contained 52.68 per cent CaO, 0.18 per cent MgO, and 5.14 per cent insolubles (J.W. McCammon, 1973, page 12).

The geological interpretation of the uplift has recently undergone revision and the stratigraphy has been reassigned to several new formations of a redefined Sicker Group and a new Buttle Lake Group (formerly the upper part of the Sicker Group), (Juras, 1987; Massey, N., Personal Communication, 1990). See Cream 1,3 (092F 220) for a description of the revised stratigraphy nomenclature.