In Rhaetic, Jurassic and Wealden floras, the Ginkgoales were exceedingly abundant (Map B, G i -G 17); in addition to A, Ginkgodium, Japan (Jurassic).
The regions from which satisfactory examples of Ginkgoales (Baiera or Ginkgo) have been recorded are shown in Map B (G1-G17).
Representatives of the Ginkgoales constitute characteristic members of the later Triassic floras, and these, with other types, carry us on without any break in continuity to the Rhaetic floras of Scania, Germany, Asia, Chile, Tonkin and Honduras (Map A, VIII.), and to the Jurassic and Wealden floras of many regions in both the north and south hemispheres.
The Palaeozoic types are barely represented; the arborescent Vascular Cryptogams have been replaced by Cycads, Ginkgoales and Conifers as the dominant classes, while Ferns continue to hold their own.
Gl - G17, Distribution of the Ginkgoales during the Mesozoic and Tertiary Periods.