Increasing atmospheric CO2 prior to the Paleocene-Eocene Thermal Maximum inferred from stomata of Ginkgo adiantoides, Bighorn Basin, Wyoming, USA

Richard S. Barclay (a) & Scott L. Wing (a)
(a) Paleobiology Department, Smithsonian Institution, National Museum of Natural History, 10th Constitution, Washington, DC 20560-0121, USA. E-mail: barclay.rich@gmail.com