The Karamken floristic assembladge from Late Cretaceous deposits (the Okhotsk–Chukotka volcanogenic belt)

L. B. Golovneva, S. V. Shczepetov

DOI: https://doi.org/10.31111/palaeobotany/2011.2.100

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Annotation

The Karamken floristic assemblage occurs from basal layers of the Kholchan Formation of the Okchotsk-Chukotka volcanogenic belt (OCVB). The locality is situated at Khasyn River near Karamken settlement. The Karamken assemblage is composed of 6 taxa: Heilungia sp., Phoenicopsis ex gr. angustifolia Heer, Sphenobaiera sp., Metasequoia sp., Taxodium amguemensis (Efimova) Golovn., Trochodendroides sp. This flora is distinct from more ancient Arman flora and younger Ola flora. According to systematic composition the Karamken floristic assemblage is similar to the Chaun flora of Central Chukotka (the Coniacian), to the Aleeki flora from the Villigha and Toomahni Rivers interfluve (the Coniacian) and to the floristic assemblage from the Leurvaam (?) Formation of Eastern Chukotka (Efimova, 1966). On this basis the age of the Karamken flora is estimated as the Coniacian.Association of the remains of Metasequoia, Taxodium amguemensis, Phoenicopsis and large leaves of Sphenobaiera is repeated in different localities in different part of the OCVB. These remains are usually connected with fine-grained volcanogenic-terrigenous paludal-lacustrine deposits.

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How to cite

Golovneva L. B., Shczepetov S. V. 2011. The Karamken floristic assembladge from Late Cretaceous deposits (the Okhotsk–Chukotka volcanogenic belt). Palaeobotany, 2: 100—113. https://doi.org/10.31111/palaeobotany/2011.2.100

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