Abstract
End-Triassic fluctuations in atmospheric carbon dioxide (CO 2) concentration were reconstructed by the use of stomatal frequency analysis on a single plant species: the seedfern Lepidopteris ottonis (Goeppert) Schimper. Stomatal index showed no distinct intra- and interpinnule variation which makes it a suitable proxy for past relative CO 2 changes. Records of decreasing stomatal index and density from the bottom to the top of the Rhaetian–Hettangian Wüstenwelsberg section (Bavaria, Germany) indicate rising CO 2 levels during the Triassic–Jurassic transition. Additionally, stomatal frequency data of fossil ginkgoalean leaves ( Ginkgoites taeniatus (Braun) Harris) suggest a maximum palaeoatmospheric CO 2 concentration of 2750 ppmv for the latest Triassic.
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