In a typical greywacke-siltstone lithology of Ordovician age, ripplemarks of several types were encountered. Besides typical asymmetrical current ripple-marks, complex and interference ripple-marks occur. Other ripple-like structures observed are longitudinal with respect to the current-direction and it is demonstrated that these are best regarded as true ripple-forms. The morphology, internal structure and lithological settings of these ripple-marks are described and inferences are drawn as to their mode of origin and the role of current-action in the formation of the sediments which contain them.
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Gilbert Kellıng (1958) studied this question.
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