By Professor Dr. Hans-Erich Reineck, Dr. Indra Bir Singh (auth.)
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Additional info for Depositional Sedimentary Environments: With Reference to Terrigenous Clastics
Below a certain critical velocity, episodes of avalanching alternate with periods when the lee face is built forward solely by the deposition of fine grains from suspension. The result is that thicker, coarser-grained laminae alternate with extremely thin laminae composed of fine-grained and light material, for example, mica flakes, clay floccules, etc. Above a certain critical velocity, avalanching is continuous, and grains in every part of the lee face are in sliding motion. Distinction between coarserand finer-grained laminae is obscured.
High-frequency pulsations do occur in streams, with a periodicity of a few seconds (7 to 14 sec). The time required for the deposition of a fore set lamina is about 1 to 2 min. Thus, periodicity of velocity pulsations is too rapid to produce the laminae. Pulsations may explain the gradational character of individual laminae. It could be argued, however, that the laminae are correlated with velocity pulsations of intermediate frequency, but no direct evidence is available. Anyway, the first two processes are probably most important and effective in the development of foreset laminae.
17). These factors are responsible for the generation of asymmetrical wave ripples. This is especially the case in the surf zone and in shallow water. Forward velocity is greater than backward velocity near the shore and causes a landward sediment transport. When the waves are long and low, the velocity difference is great, while under short steep waves, the velocity differential is small (MANOHAR,1955). Because the velocity is greater in the forward direction, more particles are rolled to the crest and over the crest from the adjacent trough.
Depositional Sedimentary Environments: With Reference to Terrigenous Clastics by Professor Dr. Hans-Erich Reineck, Dr. Indra Bir Singh (auth.)