Abstract

Oriented linear shrinkage craacks in the Green River Formation of the Uinta Basin, Utah, are subparallel features that consist of cemented coarse silt dike-like bodies a few tens of millimeters long and less than 10 mm wide that seem to be crack fillings. The features are subparallel to each other and to the crests of ripple marks with which they commonly but not exclusively occur. The features are thus at right angles to current directions.

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