ON THE CHAUN PALAEOFLORA FROM NON-MARINE CRERACEOUS OF CHUKOTKA

The Cretaceous fossil floras from the formations of the Okhotsk-Chukotka volcanogenic belt differ significantly by its systematic composition from the same-age fossil floras from the coastal lowland sedimentations. The peculiarities of fossil floras from the volcanogenic disposals are the most obvious in Chaun Flora firstly found in the volcanogenic formations of Pegtymelski Arch in Central Chukotka. L.B. Golovneva presented the results of the long-term study of this flora in the monograph published in 2018. On the base of these data and using our own experience in the stratigraphy of the Okhotsk-Chukotka volcanogenic belt and the study of the vegetation cover dynamics in the areas of modern volcanism of Kamchatka we showed that most likely Chaun Flora formed on juvenile substrata in the central parts of the vast volcanic fields being isolated form the sources of diasporas. The Chaun Flora has not clear affinity in neither lateral nor stratigraphic localization, because the fossil remains of characteristic plant species occur in different-age formations on all extent of the volcanogenic belt. The species characteristic for Chaun Flora are indicators of the certain environmental conditions and reflect the peculiarities of the processes of fossilization in the areas of terrestrial volcanism from Turon until Campanian inclusive.

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The problem of the non-marine cretaceous strata correlation in the north-east of Russia: the conditions of florogenesis in the volcanic region

Стратиграфия ◽

10.31857/s0869-592x27641-54 ◽

2019 ◽

Vol 27 (6) ◽

pp. 41-54

Author(s):

S. V. Shczepetov ◽

V. Yu. Neshataeva

Keyword(s):

Vegetation Cover ◽

Volcanic Material ◽

North East ◽

The North ◽

Local Species ◽

Fossil Floras ◽

Systematic Composition ◽

Long Term Preservation ◽

Dynamics Of Vegetation

The most part of the fossil floras from the Cretaceous volcanogenic formations of the North-East of Russia differs significantly in systematic composition from the same-age paleofloras of coastal lowlands. In order to explain the features of their formation, the modern data on the dynamics of vegetation cover on the volcanic plateaus of Central Kamchatka were used. It was shown that in the sites where the paleofloras in geological disposals of the Okhotsk-Chukchi volcanogenic belt were found, there was practically no erosion, but there was the abundance of volcanic material suitable for the formation of disposals. After the massive powerful eruptions, the inland districts of the vast volcanic areas were isolated from the sources of diasporas. Vegetation cover in these areas recovered mainly due to the pool of local species, i.e., maintained as a diasporic sub-climax. The lack of competition from angiosperms contributed to the long-term preservation in such paleofloras the ancient groups of plants and the formation of new taxa on their basis.

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INFORMATION ABOUT FLORA OF THE UST-BELSKY NATURE PARK (UDMURT REPUBLIC)

Bulletin of Udmurt University. Series Biology. Earth Sciences ◽

10.35634/2412-9518-2021-31-4-363-372 ◽

2021 ◽

Vol 31 (4) ◽

pp. 363-372

Author(s):

O.G. Baranova

Keyword(s):

Plant Species ◽

Vascular Plants ◽

Term Study ◽

Long Term Study ◽

Natural Park ◽

Udmurt Republic ◽

Nature Park ◽

Floristic Studies ◽

Cluster 2

The article presents the results of a long-term study of the indigenous flora of the Ust-Belsky Nature Park. A list of vascular plants is given. There are 588 plant species from 299 genera and 87 families. The territory of the park consists of 2 clusters. They are located on different banks of the Kama River. The list contains cluster information for each plant species. Only 477 plant species are common to the two clusters, while the remaining species are characteristic of individual sections of the natural park. There are 68 such types in cluster 1, and 43 in cluster 2. In the course of floristic studies in different years, the growth of 23 rare plant species listed in the Red Book of the Udmurt Republic was recorded on the territory of the Ust-Belsky Natural Park.

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