At the Teslin Lake Limestone occurrence, Permian limestone of the Teslin Formation (Cache Creek Complex) forms several prominent northwest trending ridges between Teslin and Galdys lakes, about 78 kilometres northeast of the community of Atlin.

The limestone and the enclosing less resistant chert, argillite, and mafic flows of the Mississippian to Triassic Kedahda and Permian French Range formations, both of the Cache Creek Complex, are warped into a series of northwest trending folds with near-vertical axial surfaces. The limestone is up to 300 metres thick. The most prominent limestone band extends northwest from Snowdon Creek along the northeast side of Hall Creek for 25 kilometres, varying up to 3.8 kilometres in exposed width. A second 13-kilometre-long band outcrops 9 kilometres to the southwest, between Hall and Gladys lakes.

The formation consists of a basal section of brown to buff weathered, tuffaceous calcarenitic limestone that is overlain by dark calcarenitic limestone and coquina containing shell fragments and foraminifera with a few chert nodules in a fine lime mud matrix. This is overlain by pale grey weathered, dark grey to massive black limestone of the youngest member of the formation.