Ripple marks

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Related to Ripple marks: Cross bedding
(Geol.) a system of parallel ridges on sand, produced by wind, by the current of a steam, or by the agitation of wind waves; also (Geol.), a system of parallel ridges on the surface of a sandstone stratum.

See also: Ripple

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
And, at the fossil trench at Marsh's Quarry, on Wren's Nest, you can still see the ripple marks made by the waves on the ancient sea bed of our own Atlantis.
Additionally, the well-washed, sublitharenite sandstone, occasional ripple marks in the sandstone, and the preferred orientation of coprolites on the bedding plane, all point to periodic moderate-to-high energy conditions.
Ripple marks on the sandstone indicate the creature was struggling to swim against a current.
Ripple marks left by the sea can still be seen in the sandstone on the summit of Pen y Fan.
Most of us admit that our very best pictures of rocks were achieved by surreptitiously pointing our cameras over his shoulder when he had carefully selected the right angle to catch the shadows on a mountain range or on a row of ripple marks. Our printed products were good but never as good as the Master's.
Fossilised ripple marks in sand formed by water currents are preserved at Black Pastures Quarry, near Chollerford, where even the casts created by burrowing worms 325 million years ago can be seen.
At the bottom of the steps leading up to the jubilee tower at Castle Hill look for the ripple marks still visible on the paving stones.
"The clincher for some of the water being on the surface is crossbeds and ripple marks in the rocks," says Mars rover project scientist Joy A.
The pattern of ripple marks and other features locked in southwestern Utah's sandstone indicates that the mineral grains had been blown in from those directions.
Schlieren exhibit layering similar to cross-bedding and preserve ripple marks along their base.
Canyon walls may also contain other structures, such as fossilized ripple marks. These marks, which look just like ripples in the sand on a beach, occur when ancient streambeds have been converted into rock and petrified.