AbstractsEarth & Environmental Science

This investigation is essentially a statistical analysis of the pattern of folding. In order to disclose the pattern of folding in a region as complex as the Howson creek area, it is necessary to determine the tops of beds. The most valuable criteria for such determinations are primary sedimentary structures, notably cross-lamination, graded bedding and ripplemark. The recognition and interpretation of these features has resulted in a fundamentally changed concept of the pattern of folding from one of isoclines and synclines with steep-dipping axial planes and little or no overturning, to one of isoclines and synclines with nearly horizontal axial planes, and as many beds overturned as not. The interpretation of secondary linear and planar structures confirms this pattern. Accordingly, the thickness of the Slocan sedimentary series is computed to be in the order of 37,000 feet, over five times that formerly postulated.