ABSTRACTThe equation used by Skipper (1971) to derive flow velocity from antidune wavelength is satisfactory for open‐channel conditions, but must be modified for antidunes formed by density currents. Calculations based on the modified equation indicate a much higher flow density than was originally proposed for antidunes of the Cloridorme Formation. It further appears that the water waves accompanying these particular antidunes developed not at the upper boundary of the turbidity current, but at a density discontinuity within a few centimeters of the bed. Textural features of the Cloridorme turbidites are compatible with this interpretatio