Abstract
Abstract The apposition fabric in different sedimentary deposits is discussed from genetic and structural points of view. The preferred orientation of most particle sizes, transported in contact with a frictional substratum, is usually transverse to the direction of transport. Particles immersed in the transporting medium, such as glacier ice, water, gravitating masses etc., tend to align themselves parallel with the direction of movement, owing to the shearing stress of the moving medium. Heavy collisions or obstacles to the particles disrupt their trajectories and final position. The actual dip of flattened particles in fluvial imbrication beds, calculated graphically and mathematically or measured directly against a standing water level, indicates the direction of transport more adequately than the long-axis orientation of prolate particles. The fabric has a typical monoclinic symmetry, if the bed and flow geometry is not asymmetric. The preferred dip is between 10° and 30° to the flow direction in the...
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