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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
January 02, 2021 • 03:32 am
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30 points
30 points
- IIT JAM
- Geology (GG)
Iit jam 2020
9 Match the primary sedimentary structure in Group I with the corresponding process of formation in Group II. Group I P. Asymmetric ripples Q. Dish and pillar R. Flute cast S. Wavy bedding Group II 1. Water escape 2. Bed load transportation of sediments 3. Deposition from alternate traction and suspension load 4. Scouring by turbulent eddy (B) P-2 (C) P-2 (D) P-3 (A) P-1 Q-3 Q-4 R-1 S-3 Q-1 R-4 Q-1 R-4 R-2 S-4 S-2 S-3
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Rahul kumar Best Answer
Answer (B) P-2, Q-1, R-4, S-3 Assymetric ripples (current ripples) are formed by bed load transportation of sediments. Dish and pillar are water escape structures formed after deposition of sediments. As a result of compaction, the excess water captured in pore spaces come out leading to the formation of dish (for horizontal movement) and pillar (for upward movement) structures. Flute casts are formed as a result of current scouring. High speed currents scour the top of previously deposited beds and subsequently deposited coarse grain sediment takes up the shape of scoured surface and result into flute cast. Wavy beddings are characteristic structure of tidal Environment. Due to fluctuating current conditions, different grain sized sediments get deposited in a single strata.
sir can u share dish and Piller picture
Here is a picture of dish and pillar structure from wikiwand. Concave upward (red) part is indicating dish str whereas vertical (light green) part is indicating pillar str.