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Answer: 50 million years Rate of deposition = 1 cm / 1000 years Thickness of sedimentary sequence = 500 m = 50000 cm Time taken (assuming constant sedimentation rate and ignoring compaction effect) = Thickness of sedimentary sequence / rate of deposition = [50000 cm] / [1 cm / 1000 years] = 50000000 years = 50 × 10^6 years = 50 million years