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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Ishita Das posted an Question
December 12, 2020 • 01:00 am
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30 points
30 points
- IIT JAM
- Geology (GG)
Shown below is a profle section of a folded sequence consisting of limestone, cross bedded sandstone and shale.
Shown below is a profle section of a folded sequence consisting of limestone, cross bedded sandstone and shale. The fold can be termed as (A) Symformal syncline (C) Antiformal syncline (B) Synformal anticline (D) Antiformal anticline
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Saurabh 1 Best Answer
Correct answer: Synformal Anticline.....It's a synformal as it is closing downwards or concave upwards. And one can see tangential contact of the cross beds which shows older beds . So clearly older beds in core, hence an Anticline.
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Why are we not considering the depositional sequence here. Like in the limb it is Sandstone right and in the core it is Shale. We all know coarser sediments are deposited initially, so sandstone is deposited first, hence older in the limb and younger shale in the core, so according to this it will be Synformal syncline right?
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Sajan sarthak![best-answer]()
synformal because of diping beds are towards each other but anticlinal due to core is older... How we know that from the trough cross bedding has a tangent relationship with older bed... so synformal anticline
core is younger in synclines. i guess you meant syncline??!!
No it's anticline I refer.
look the figure
see this too
Why are we not considering the depositional sequence here. Like in the limb it is Sandstone right and in the core it is Shale. We all know coarser sediments are deposited initially, so sandstone is deposited first, hence older in the limb and younger shale in the core, so according to this it will be Synformal syncline right?
we can't consider in that way...cross bedding here is given its a great clue to find out older and younger...it's not like that always sand will be bottom and shale on top ... depending upon the environment it changes....you just remember synform dipping same direction. antiform dipping opposite direction ..... syncline core younger .....anticline core older.
thank you so much sir for clearing this