Hummocky cross-stratification
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Hummocky cross-stratification is a form of cross-bedding usually formed by the action of storms. It takes the form of a pile of "smiles", crosscutting the crescents below.
While it is usually formed in marine settings by the action of storms, it may also be deposited in fluvial strata; a fluvial origin is more likely if the unit solely comprises sand.[1]
