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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Ishita Das posted an MCQ
December 10, 2020 • 02:37 am
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30 points
30 points
- IIT JAM
- Geology (GG)
Which one of the following sedimentary structure does not mark the top surface of a bed?
Which one of the following sedimentary structure DOES NOT mark the top surface of a bed?
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Rahul kumar
Mud cracks are formed as a result of dessication and exposure to the continental conditions. Mud cracks form at the top of the bed. Similarly, rain prints are formed by exposure of sedimentary bed to the continental conditions. In this way, rain prints also indicate the top surface of the bed.
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Rahul kumar
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Flute cast forms at the bottom of the bed as a result of current scouring. Current ripple, Rain print and Mud cracks for at the top surface of a bed.
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how exactly at the bottom of the bed? it is formed by erosion right, so as far as i can imagine the current is scouring the top of the bed and can't really imagine a bed being scoured at the bottom. please explain
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Rahul kumar Best Answer
Yes, current scour the top of the bed and create moulds. Flute casts are the cast structure form from these moulds and form at the bottom of the beds. For more details, look at the diagram below.
thank you so much sir for clearing this