Paleobotanical evidence for near present-day levels of atmospheric CO2 during part of the tertiary

Royer, D. L.;Wing, Scott L.;Beerling, D. J.;Jolley, D. W.;Koch, P. L.;Hickey, Leo J.;Berner, R. A.

Date: 2001

Royer, D. L., Wing, Scott L., Beerling, D. J., Jolley, D. W., Koch, P. L., Hickey, Leo J., and Berner, R. A. 2001. "Paleobotanical evidence for near present-day levels of atmospheric CO2 during part of the tertiary." Science. 292 (5525):2310–2313.