Geologic literature on jointing contains little reference to the problem of separating regional joint-set directions from those of joint sets related to individual structures. From study of joints in Cardium strata near South Ram River in the Foothills of central Alberta, a method is proposed by which to make this separation. The method is suggested as a means of distinguishing those widely distributed directions of jointing that may owe their origin to regional uplift and erosional unloading, from those joint sets that are directly related to development of a single structure, such as a fold. Because of the close connection between jointing and development of fracture porosity and permeability in the subsurface, there is need to predict both those joint-set orientations which will probably occur on a regional scale and those sets which are more likely to be localized in their incidence.

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