Curved, grading into planar, discordant slump scar surfaces are not uncommon in sedimentary rocks. It is suggested that the slump movement took place penecontemporaneously with the processes of sedimentation and in response to loading imbalances due to the presence of a slope. The curvature of the slump surface may be derived by resolving the vector representing the displacement, or offset, and relating its vertical component to the volume decrease associated with void ratio reduction. The particular shape of the surface is largely a function of the clay mineral content of the sediments.

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