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Arman’ Flora of the magadan region and development of floras in the North Pacific during the Albian-Paleocene

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Abstract

The Arman’ Flora from volcanogenic-sedimentary deposits in the Arman’ River basin and Naraula Formation in the Nel’kandzha-Khasyn interfluve includes 82 species of fossil plants comprising liverworts, horsetails, ferns, caytonealeans, cycadaleans, ginkgoaleans, czekanowskialeans, conifers, gymnosperms incertae sedis, and angiosperms. The Arman’ Flora appears to be of Turonian-Coniacian age, as it is close to the reliably dated Penzhina and Kaivayam floras from the Northwest Kamchatka and to Tyl’pegyrgynai Flora of the Pekul’nei Ridge. The dating is consistent with isotopic dates (40Ar/39Ar and U-Pb SHRIMP) characterizing the age of plant-bearing sequences. Based on the considered position of the Arman’ Flora in the scheme of Cretaceous florogenesis, a leading role in that florogenesis was played by the gradual invasion of floras by new, angiosperm dominated, plant communities. These communities initially populated unstable habitats in the coastal lowlands of Northeast Asia and Alaska, gradually invading with time the Asiatic intracontinental areas. The peculiar combination of Early and Late Cretaceous plants characteristic of the Arman’ Flora is strong evidence that Cenophytic plant communities dominated by angiosperms colonized areas still populated in the Late Cretaceous by Mesophytic communities. Absence of Mesophytic and Cenophytic taxa mixing in the Arman’ Flora burials suggests a replacement of plant communities as whole rather than of separate plants by more advanced taxa.

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    A. B. Herman

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Original Russian Text © A.B. Herman, 2011, published in Stratigrafiya. Geologicheskaya Korrelyatsiya, 2011, Vol. 19, No. 1, pp. 72–87.

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Herman, A.B. Arman’ Flora of the magadan region and development of floras in the North Pacific during the Albian-Paleocene. Stratigr. Geol. Correl. 19, 71–86 (2011). https://doi.org/10.1134/S0869593811010023

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