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Pacific Coastal & Marine Science Center

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

Cross-Bedding, Bedforms, and Paleocurrents

Photographs

Photo of rock or sand showing pertinent structure or structures; see caption below.

FIG. 75.  Structure produced by bedforms like those simulated in Figure 74; Navajo Sandstone (Upper Triassic? and Jurassic) at Johnson Canyon, Utah.  The set of cross-beds analagous to the structure in Figure 74 is the compound set that occupies much of the lower half of the photograph; the thickness of that set is approximately 10 m.

RECOGNITION: The main dune migrated from left to right, and, if the computer simulation in Figure 74 is an accurate analogy, the superimposed bedforms migrated obliquely upslope,  obliquely downslope, and through the outcrop plane.  The three-dimensional structure of this outcrop was not studied in detail in the field; consequently, similarity with the computer simulation in other dimensions (and thus true similarity with the computer simulation) has not been demonstrated. 

 

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