The Chapperon showing is located 52 kilometres west of Vernon, south of Chapperon Creek.
In this area, Devonian to Triassic volcanic and sedimentary rocks of the Harper Ranch Group and the Permian and older Chapperon Group are intruded by Middle Jurassic granitic rocks. Extensive Eocene Kamloops Group volcanic and sedimentary rocks overlie the older units.
Kamloops Group sediments host petrified (silicified) wood and agate.