Critical Coulomb Compressional Wedge. Particles within the deforming mass have a coefficient of interparticle friction of 0.58; the friction coefficient between internal particles and the rigid row of balls at the base is 0.30, defining a weak horizontal decollement. As the left boundary moves inward, the mass is compressed, causing folding and discrete faulting of the layered beds; both fore-thrusts and back-thrusts are formed. The colored layers are observed to thicken in compression, apparently due to distributed flow of the particles.. The wedge forms a "critical taper" which is apparently maintained as deformation proceeds.

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