Abstract
Fossils of Ginkgophyta are widely recognized as a suitable proxy to estimate Mesozoic and Cenozoic atmospheric CO2 levels. In this study, the fossil Ginkgoites species, Ginkgoites huttonii (Sternberg) Black is described based on a collection from the Middle Jurassic (Bajocian) deposits in Northeast Iran. The palaeoatmospheric CO2 level during Middle Jurassic in Iran is estimated for the first time based on the stomatal ratio (SR) method using this plant fossil. We show that the palaeoatmospheric CO2 concentration was about 1123 ppmv as calculated from stomatal parameters measured in this study. A comparison of our results with previously reported geochemical models indicates close accordance with the GEOCARB II model for Middle Jurassic.
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