The study of paleoflow patterns is an essential part of basin analysis. Cross-stratification, both planar and trough, is the principal directional structure used for paleocurrent analysis. Trough cross-stratification is especially characteristic of fluvial deposits, where it is typically formed by the primary current and correlates strongly with the flow direction (Harms and Fahnestock 1965; Wermund 1965; Williams 1968; Barrett 1970; McGowen and Garner 1970; Dott 1973; Michelson and Dott 1973; High and Picard 1974). The only exception, reported by Meckel (1967), is an artifact of an erroneous sampling technique (High and...

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