Earth Science Quiz
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DEEP TIME AND EARTH HISTORY
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A sediment core from the North Atlantic shows a distinct transition in its microfossil record. The lower, older layers are dominated by the planktonic foraminifera species Neogloboquadrina pachyderma (sinistral), while the upper, younger layers are dominated by Globigerinoides ruber. Given that N. pachyderma (s.) thrives in polar waters (<8°C) and G. ruber prefers subtropical waters (>20°C), what is the most robust conclusion?
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