Discussion
Choose the correct sequence of deformation and metamorphism :
Answer: A
The correct sequence is Shale → Slate → Phyllite → Schist → Gneiss.
With increasing deformation and metamorphic grade, a mudrock first becomes slate with a fine slaty cleavage, then phyllite with a silky sheen as micas grow, then schist with visible mica giving schistosity, and finally gneiss, in which minerals segregate into light and dark bands.
Option B puts schist after gneiss, option C puts slate after schist, and option D runs the series backwards, so each breaks the order of increasing grade.
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