Paleocurrent Explained

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.[1]

There are two main types of paleocurrent indicators:

Paleocurrents are usually measured with an azimuth, or as a rake on a bedding plane, and displayed with a Rose Diagram to show the dominant direction(s) of flow. This is needed because in some depositional environments, like meandering rivers, the paleocurrent resulting from natural sinuosity has a natural variation of 180 degrees or more.[2]

Below are a partial list of common paleocurrent indicators:

Unidirectional

Bidirectional

References

  1. Prothero, D. R. and Schwab, F., 1996, Sedimentary Geology, pg. 48–51,
  2. Miaoa . Xiaodong . Huayu Lua . Zhen Lid . Guangchao Caod . Paleocurrent and fabric analyses of the imbricated fluvial gravel deposits in Huangshui Valley, the northeastern Tibetan Plateau, China . . 99 . 1–4 . 433–442 . © 2007 Elsevier B.V. . July 2008 . 10.1016/j.geomorph.2007.12.005 . 2008Geomo..99..433M .