Stevenson Ridge map area is generally poorly exposed due to heavy vegetative cover and an extensive veneer of Quaternary sediments. The nature of bedrock and contact relationships are highly speculative throughout large parts of the map area.
The interpretation of the bedrock geology presented in this map is based on sparse and widely separated field observations extrapolated with the use of regional aeromagnetic data from the Geological Survey of Canada (Geological Survey of Canada, 1969).