Figure 3. Complete FTIR spectra (650–4000 cm⁻¹) of fossil and modern Metasequoia resins.

A–B. duplicate analyses of the amber from Panda wood. C. Middle Eocene amber from post-eruptive sediments in the Giraffe kimberlite pipe, which has not been thermally altered [7], [19]. Insets show typical fragments of Panda and Giraffe Metasequoia ambers (scale bars are 5 mm). D. Modern resin from M. glyptostroboides cultivar (Washington DC, USA) is visually identical to the Giraffe material. E. The spectroscopic differences between Panda and modern Metasequoia resins reveals features associated with thermal maturation (grey area is±1 SD of the difference).