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EARTH'S AIR PRESSURE 2.7 BILLION YEARS AGO CONSTRAINED TO LESS THAN HALF OF MODERN LEVELS
Som, S., Buick, R., Hagadorn, J., Blake, T., Perreault, J., Harnmeijer, J., and Catling, D., 2016, Earth's air pressure 2.7 billion years ago constrained to less than half of modern levels: Nature Geoscience, v. 9, p. 448-451, https://doi.org/10.1038/ngeo2713.