Various beds of limestone of the Mississippian Milford Group outcrop for 18 kilometres along the west side of Kootenay Lake in the vicinity of Ainsworth, between Bjerkness Creek to the north and Coffee Creek to the south. At Lendrum Creek, 5 kilometres northwest of Ainsworth, 3 kilometres west of Kootenay Lake, they strike approximately 174 degrees and dip 29 to 50 degrees west. To the east they become intercalated with folded phyllite and mica schist.

In the vicinity of Lendrum Creek the beds are comprised of very fine grained dark to light grey, locally white limestone. In a few places sections of clean limestone contain sheets of felsite up to a metre thick. Six samples comprised of chips taken at 0.30 metre intervals across bedding over various widths assayed as follows (in per cent) (J.T. Fyles, 1961, Samples 943-948):

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Sample 943 944 945 946 947 948

Width(m) 1.82 4.57 2.44 4.57 2.44 4.57

CaO 47.17 45.80 55.22 44.65 54.51 53.96

MgO 6.66 7.17 0.29 9.49 1.12 1.43

Insol. 1.06 1.02 0.24 0.34 0.24 0.30

R2O3 0.48 1.38 0.18 0.14 0.06 0.06

Fe2O3 0.17 0.57 0.04 0.03 0.01 0.02

MnO 0.12 0.57 0.03 trace trace trace

P2O5 0.04 0.06 0.05 0.04 0.02 0.02

Sulphur 0.003 0.004 0.005 0.003 0.003 0.003

Ig. Loss 44.76 44.64 43.78 45.53 44.7 43.98

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All samples were taken on logging roads just south of Lendrum Creek. Samples 943 to 945 represent a single continuous section across 8.83 metres.