Systematic composition and evolutionary significance of floristic assemblage of the Toptan Formation (Lower Cretaceous, North-East of Russia)

L. B. Golovneva, S. V. Shczepetov, A. E. Livach

DOI: https://doi.org/10.31111/palaeobotany/2017.8.28

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The analysis of the distribution of plant remains in deposits of the Aigur and Toptan formations (Omsukchan district of the Magadan Region) showed that the main part of the species that were included in the Toptan stratoflora (Samylina, 1976), in fact come from the Aigur Formation. Floristic assemblages of the Aigur and Toptan formations are very similar in systematic composition. Increasing the diversity of flowering plants and reduction of typical Cretaceous taxa (cycadophytes and Ginkgoales was not indicated on the boundary between these formation. Thus, there is no evidence of significant changes in the floristic composition at this stratigraphic level and the existence of independent Toptanian stage in the evolution of the mid-Cretaceous flora of the North-East of Russia. Floristic assemblages from the Galimyi, Aigur and Toptan formations are proposed to be merged into a single Sugoi flora, which should be attributed to the Buor-Kemus stage of floral development (lower-middle Albian). The description of the lectostratotype of the Toptan Formation is first published and distribution of this formation is illustrated.

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How to cite

Golovneva L. B., Shczepetov S. V., Livach A. E. 2017. Systematic composition and evolutionary significance of floristic assemblage of the Toptan formation (Lower Cretaceous, North-East of Russia). Palaeobotany, 8: 28—44. https://doi.org/10.31111/palaeobotany/2017.8.28

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