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Pacific Coastal & Marine Science Center

Bedform Sedimentology Site: “Bedforms and Cross-Bedding in Animation”

Cross-Bedding, Bedforms, and Paleocurrents

Animations

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.

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.

View Dip Plots, Static Images + Full Caption

 

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