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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)


Journal of Sedimentary Petrology
Vol. 33 (1963)No. 1. (March), Pages 23-40

An Automated Grain-shape Classifier

William H. Glezen, John C. Ludwick


The velocity acquired by a particle in descending a roughened inclined chute is a measure of three-dimensional particle shape. This principle is embodied in an automatic device for classifying coarse sand grains into three shape classes: spherical, intermediate, and tabular. Six samples of 1500 grains each can be classified in 2.5 hours.

Tabularity, a particle property of significance in settling velocity work, is the geometric shape attribute that most strongly affects particle descent velocity in a chute. That this attribute is geologically significant is suggested by the emergence of well-defined sub-regional patterns of particle shape distribution.

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