Abstract
Trough cross-stratification is formed by down-current migration of simple, three-dimensional dunes, and trough axis orientation is a reliable indicator of paleocurrent. Although cross-strata attitudes have a wide degree of scatter owing to the shapes of the scour and fill surfaces, these shapes can be modeled to a first approximation as second-order curved surfaces. Statistical treatment of cross-strata attitudes can define these surfaces, and the direction of plunge of their axes, with a reasonably small data set. This data reduction is performed easily on a microcomputer, and will produce unambiguous results regardless of asymmetry of data distribution.
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