A system of parallel wavy ridges and furrows left on sand, mud, or rock by the action of water or wind.
- The second clue is that many of the rocks have very conspicuous ripple marks on, which at least at first glance resemble those we might find on a common day seashore.
- The absence of symmetrical ripple marks indicates that the site of deposition was protected from wave action.
- 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.
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