The possibility that bedding and cross-lamination can be displayed by only an alternation of packing patterns was demonstrated in the laboratory by an artificially deposited clastic "rock." A model of a coarse sandstone built up of uniform wooden balls, thereby eliminating entirely differences in size, shape, and composition of the constituent particles and restricting the differentiating variable to packing, showed bedding. Although this arrangement has not been located in natural rocks, it may be found after appropriate search. Hope for its existence is strengthened by the fact that open and close packing within sands is well known.

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