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A Short Historical Review of Clastic Tidal Sedimentology
The best studied modern tidal environments are tidal flats, tidal inlets and deltas, and subtidal shelf sand banks (including tidal sand ridges and fields of large-scale dunes). At present, much sediment is being deposited in large, tide-dominated river deltas, which remain little investigated and understood. The best criteria for recognition of ancient tidal sediments are: 1) tidal bundles and evidence for other neap-spring rhythms; 2) flaser, wavy and lenticular bedding, particularly where present in 3) fining-upward cycles with supporting evidence for deposition on prograding tidal flats; and 4) crossbedding with evidence for current reversals, such as opposed cross-strata, regularly spaced reactivation surfaces, and mud drapes.
A distinction should be made between morphological elements, such as tidal flats, clearly formed by tidal action, and environmental systems, such as estuaries, composed of a large number of morphological elements, only some of which are tidal.
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