The Envymaam floristic assemblage from the Upper Cretaceous deposits of the Okhotsk-Chukotka volcanogenic belt

L. B. Golovneva, S. V. Shczepetov

DOI: https://doi.org/10.31111/palaeobotany/2014.5.42

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Annotation

The Envymaam floristic assemblage occurs from basaltic rocks of the Envymaam Formation in the Envymaam River basin, Central Chukotka segment of the Okhotsk-Chukotka volcanogenic belt. This assemblage consists of 18 taxa: Hepaticites sp., Coniopteris tschuktschorum (Krysht.) Samyl., Phoenicopsis ex gr. angustifolia Heer, Cupressinocladus enmyvaamensis Golovn., sp. nov., Araliaephyllum philippoviae Golovn., sp. nov. Among them, two species are fi rstly described. The Envymaam assemblage is characterized by presence of the Early Cretaceous relicts (Phoenicopsis), by rarity of angiosperms and by small sizes of their leaves.

Age of the Envymaam floristic assemblage is determined as the late Campanian on the basis of systematic composition, palynological, paleomagnetic and isotopic data.

Direct continuity between the Envymaam and the Ust’-Emuneret floristic assemblages from the subjacent Emuneret Formation it isn’t observed that is caused probably by the poor composition of the Envymaam floristic assemblage. Palynological assemblages from the Envymaam, Ust’-Emuneret, Ola and Arkagala Formations are very similar.

Section: Articles

How to cite

Golovneva L. B., Shczepetov S. V. 2014. The Envymaam floristic assemblage from the Upper Cretaceous deposits of the Okhotsk-Chukotka volcanogenic belt. Palaeobotany, 5: 42—59. https://doi.org/10.31111/palaeobotany/2014.5.42

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