Limestone of the Lower Cambrian Badshot Formation outcrops along the west shore of Galena Bay on the east side of Kootenay Lake and continues northward across a small promontory jutting into the lake for 1600 metres. The bed strikes 000 degrees and dips 35 degrees west. Thicknesses vary up to 60 metres. The unit is overlain by mica schist of the Index Formation (Lardeau Group) and underlain by hornblende schist of the Hamill Group.

The bed is comprised predominantly of calcium limestone interbedded with dolomite. In the vicinity of the Bluebell Mine (82F 043) the limestone contains sulphides with silicates and graphite. Tremolite and quartz become abundant near the top and bottom of the bed. A sample taken south of the Bluebell Mine across a 15 metre section contained 48.71 per cent CaO, 3.93 per cent MgO, 4.96 per cent SiO2, 0.22 per cent Al2O3, 0.16 per cent Fe2O3 and 0.02 per cent sulphur (Canada Bureau of Mines Report 811, p. 212, Sample 84).

A small amount of limestone was once quarried to produce lime.