
A paleocurrent or paleocurrent indicator is a geological feature (typically a sedimentary structure) that helps one determine the direction of flowing water in the geologic past. This is an invaluable tool in the reconstruction of ancient depositional environments. There are two main types of paleocurrent indicators: Paleocurrents are usually meas...
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http://en.wikipedia.org/wiki/Paleocurrent

An ancient current, which existed in the geologic past, with a direction of flow that can be inferred from cross-bedding, ripple marks, and other sedimentary structures.
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http://www.evcforum.net/WebPages/Glossary_Geology.html
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