Discussion
None of the following is a primary sedimentary structure except
Answer: D
Correct answer: graded bedding
Graded bedding forms as the sediment is deposited, from a decelerating current dropping its coarsest load first, so it is a primary sedimentary structure - as are cross-bedding, ripple marks and mud cracks. The other three belong elsewhere: foliation is metamorphic, produced by directed pressure, while columnar jointing and porphyritic texture are both igneous, recording cooling contraction and a two-stage cooling history respectively.
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