Abstract

A common but seldom identified sedimentary structure which occurs in a variety of nearshore deposits is truncated wave-ripple laminae. This structure consists of sets of parallel laminae that were deposited conformably with the original wave-rippled surfaces but were partly eroded prior to deposition of the next set of wave-ripple laminae. Ripple wavelengths vary from 10 cm to 10 m and ripple indices from 4 to 17. Small-scale truncated wave-ripple laminae differ from the large-scale form only in size. A satisfactory mechanism for formation of the large-scale wave ripples is unknown.

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