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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Shivam Sharma posted an Question
September 06, 2020 • 23:46 pm
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30 points
30 points
- CSIR NET
- Earth Sciences
Two sedimentary structures occur commonly in tidal regions and are caused by the mixing of sand- and mud-sized fractions. name the structure when mud-deposition
Two sedimentary structures occur commonly in tidal regions and are caused by the mixing of sand- and mud-sized fractions. Name the structure when mud-deposition is intermittent with ipple migration causing mud to be deposited in ripple troughs. Name the isolated ripples that Occur as cross-laminated lenses within mud or mudstone in a vertical section. Differentiate between desiccation cracks and syneresis cracks on the basis of morphology, process of formation, and depositional environment.
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Rahul kumar![best-answer]()
Two sedimentary structures found in tidal environment 1. Flaser bedding 2. Lenticular bedding. In flaser bedding mud-deposition is intermittent with ripple migration causing mud to be deposited in ripple troughs. In case of lenticular bedding; isolated ripples that occur as cross-laminated lenses within mud or mudstone in a vertical section. For further details please see the attached figure Dessication cracks form when mud is exposed to sun light; whereas syneresis cracks form in sub-aqueous condition. Dessication cracks form in continental environment whereas syneresis cracks form in sub-aqueous environment. Dessication cracks are hexagonal in outline whereas syneresis cracks are irregular in outline.