Ancient stream directions in the lower Morrison formation of the Chuska Mountains, Arizona, may be reconstructed through use of cross-stratification mapping techniques. Dip directions of the cross-strata, when combined in the forms of histograms and vector resultants, indicate directions of paleostream flow. This latter is the direction of maximum porosity and hence the direction along which uranium orebodies and the bleached zones that surround them are most likely to be found. Plotting of the sedimentation structural features defines intersections of ancient stream systems, and these localities appear to be favorable loci for deposition of uranium ore. A possible relation between type of stratification and location of uranium orebodies is described.

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