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Terzaghi (Geotechnique 12 (1962) 251) and Young (Young, A., 1972. Slopes. Oliver and Boyd, Edinburgh, 288 pp.) described the stable forms of slopes in sedimentary rock masses, assuming penetrative discontinuities, which are parallel to bedding and joints which are perpendicular to bedding. The only movements considered were slides along bedding. Experience in the Canadian Rockies indicates that the cohesionless rock masses that exist at or above tree line may also move by toppling, buckling and sliding along joints. These processes also act to limit the inclinations of stable slopes. Rock strength is a factor in the critical height of a slope that buckles. The processes can be represented as fields on a process diagram, a plot of slope inclination against bedding dip, using the basic friction angles of the rocks present.The process diagram also separates five common mountain peak shapes, which form on homoclinal sequences of beds. Castellate and Matterhorn mountains occur in sub-horizontal beds, cuestas develop in gently to moderately dipping beds. Hogbacks formed in moderately to steeply dipping beds have similar slope angles on both cataclinal and anaclinal slopes. Dogtooth mountains occur in steeply dipping sub-vertical beds. [Copyright &y& Elsevier]

To fulfil a political promise to eliminate the provincial fiscal deficit, the (conservative) Premier of Alberta cut all budgets by roughly 20 per cent in 1993–1994. As an unanticipated by-product, this political solution to a political problem resulted in a 32 per cent decrease in provincial imprisonment between 1993 and 1997. Economic imperatives created the catalyst for changes in imprisonment policies. However, the types of change and the mechanisms for achieving them reflected Canada’s specific history, culture and politico-legal structures. Decarceration was consistent with core Canadian values rooted in the long-standing belief in the need for restraint in the use of imprisonment and a lack of faith in its effectiveness as a crime control strategy. On the surface, this case study is yet another example of decarceration. However, the interactive and multifactorial explanatory model underlying Alberta’s reduction in its prison population raises questions about not only single factors or simple additive models as explanations for changes in penal policies but also uni-dimensional solutions to jurisdictions in need of fiscal restraint. The historical and cultural embeddedness of Alberta’s decarceration alerts us to its country-specific nature and the need to situate imprisonment in a broader set of concerns. [ABSTRACT FROM AUTHOR]