The traditional distinction between oscillation or symmetrical ripple marks and current-formed ripple marks is in need of modification. Recent studies along the shores of Prince Edward Island, Cape Breton, and tidal flats of the Bay of Fundy show that waves may produce either symmetrical (or oscillation-type) ripple marks or asymmetrical ripple marks. Failure to recognize how the principle operates has considerably reduced the value of the well illustrated paper by Trefethen and Dow in a recent publication [GeoScience Abstracts 3-12991].

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