Air density 2.7 Gyr ago limited to less than twice modern levels by fossil raindrops
Full Citation:
2012: Som, S.M, Catling, D.C., Harnmeijer, J.P., Polivka, P.M. & Buick, R. Air density 2.7 Gyr ago limited to less than twice modern levels by fossil raindrops. Nature, 484, 359-362.
