Jaspagate (synonymous with agate jasper) and petrified wood occurs on the ridge about 800 metres east of the 'Lehman ranch buildings'. Access is via the Upper Hat Creek road, off of Highway 12, about 18 kilometres west of Cache Creek (Western Homes & Living, October 1961).
Geological Survey of Canada Map 42-1989 shows the area to be underlain by volcanic and sedimentary rocks of the Eocene Kamloops Group.