New data on the late cretaceous flora of the New Siberia island, New Siberian Islands

Abstract

New plant fossils collected in 2016 from the Derevyannye Gory Formation on the New Siberia Island are studied. Thirty species of fossil plants are identified and illustrated. They belong to liverworts, ferns, ginkgoaleans, conifers and angiosperms. Sixteen of them have not beed found in the New Siberia Flora before. A new angiosperm species Dalembia (?) gracilis Herman is described. The New Siberia Flora is characterised by a moderately high taxonomic diversity, predominance of conifers and angiosperms with large-leafed platanoids and trochodendroids being the most abundant among angiosperms, by predominance of dentate-margined angiosperms and rarity of plants with entire-margined leaves, and by absence of cycadaleans and bennettitaleans. The flora existed during the Turonian–Coniacian time interval and most probably should be dated as Turonian. Plants of the New Siberia Flora experienced a warm-temperate humid climate with warm summers, mild frost-free winters and insignificant seasonality in precipitation.

Environmental Assessment of Dust-Holding and Oxygen-Producing Productivity of Hawthorns in Kazakhstan

“…Studies of the Upper Cretaceous flora of North Asia and the Gilyak flora of Sakhalin are very interesting, where prints of 101 tree species were found, including Crataegus L. In the Tertiary period, imprints of C. kornerupii Heer leaves from the flora of the Balatamskaya stratum of Turgay were found. In the Quaternary period, many woody plants and brushwood, including hawthorns, died out due to a sharp change in climate (German et al, 2019). In the Sarmatian flora, the leaves of C. sarmatika Krysht., C. praemonogyna Krysht.…”