A previous study (Gibbons, 1969) is developed to provide indications of avoidable and unavoidable biasses in various methods of grain counting and grain selection when sandstone imbrication is studied in planar sections through the rock. The analysis is in terms of individual grains, and of classes of grains with similar shape/orientation attributes. Results have application in experiment design, and should assist valid evaluation of future statistical studies. Special attention is given to problems of overgrowths and crystallographic orientation of quartz grains.

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