Figure 59. Structure formed by migrating bedforms with spurs that reverse asymmetry and migration direction but have no net along- crest displacement. Vertical sections perpendicular to the trend of the main bedforms contain scallops, whereas sections parallel to the main bedforms contain zig-zag structures. Because the zig-zag structures have cross-beds that reverse in their direction of dip in the outcrop plane, the structures might be called herringbone cross-beds by some workers. In a strict sense, however, the structures are not true herringbones because the dip directions are not diametrically opposed.
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U.S. Department of the Interior | U.S. Geological Survey | Western Coastal & Marine Geology
URL: http://walrus.wr.usgs.gov/seds/bedforms/movie_pages/movie59.html
Maintained by: Laura Zink Torresan
Modified: 17 October 2006 (lzt)