Discussion
The Siwalik sequence represents the fluvial deposition of the Himalayan foreland basin while the marine sequence is marked by :
Answer: A
The marine sequence is the Subathu Formation.
The Himalayan foreland basin fill begins with the Subathu Formation, shales and limestones of late Palaeocene to middle Eocene age laid down in a shallow sea before the Tethys finally closed. Above it the sediments become continental: the Dagshai and Kasauli (and Murree) red beds, followed by the fluvial Siwalik molasse.
The Murree Formation and the Kasauli Group are continental, not marine, and the Pinjor Formation is part of the Siwalik sequence itself, so none of them marks the marine phase.
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