Kvale, Erik P. Indiana Geological Survey, Indiana University, Bloomington, Indiana.
Last reviewed:December 2019
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Sediments deposited by tidal processes. Until recently, “tidalites” referred to sediments deposited by tidal processes in both the intertidal zone (between normal low- and high-tide levels) and shallow, subtidal (permanently submerged), tide-dominated environments less than 200 m (660 ft) deep. Tidalites are now known also to occur within supratidal environments (above normal high tide and flooded only during storms or very high spring tides) and submarine canyons at depths much greater than 200 m. Common usage has drifted toward describing tidalites as ripple- and dune-scale features rather than more composite deposits such as large linear sand ridges of tidal origin present on continental shelves or point bars associated with migrating tidal channels. Both of these larger-scale features, however, would be composed of tidalites.
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