Lightning Cr . Sand and grave/ - Bou/der clay . Slide rock . Bedrock Line of boreholes /2 Mile above Le fontairie shaft La fontaine shaft . Recent river gravels . Glacial gravelsand silts -. Bou/der clay , Gold-bearing gravels . Bedrock . Recent river gravels . Glacial gravels . Glacial silt and clay Boulder clay . Sand and gravel . Gold-bearing gravels . Bedrock A B. Cc D. 7 a F. G Line of boreholes 2 miles below La Fontaine Scale of Feet Geological Survey, Canada. Figure 29. Cross-sections of Lightning creek near Stanley, Cariboo district.