A band of grey limestone of the Hadrynian Horsethief Creek Group trends northward along the east side of Kootenay Lake. The band is exposed over a width of 1000 metres, where it crosses La France Creek. The unit strikes 006 to 016 degrees and dips 45 to 55 degrees west, just north of the creek.
Limestone was quarried on La France Creek during 1923 and 1927 by Thomas Wall for agricultural purposes. A total of 83 tonnes were quarried.