PALAEOENVIRONMENT AND ECOLOGY OF THE MIDDLE CRETACEOUS GREBENKA FLORA OF NORTHEASTERN ASIA
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dc.contributor.author | Spicer R.A. | |
dc.contributor.author | Ahlberg A. | |
dc.contributor.author | Herman A.B. | |
dc.contributor.author | Kelley S.P. | |
dc.contributor.author | Raikevich M.I. | |
dc.contributor.author | Rees P.M. | |
dc.date.accessioned | 2021-06-18T05:48:32Z | |
dc.date.available | 2021-06-18T05:48:32Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=14277375 | |
dc.identifier.citation | Palaeogeography, Palaeoclimatology, Palaeoecology, 2002, 184, 1-2, 65-105 | |
dc.identifier.issn | 0031-0182 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/29130 | |
dc.description.abstract | The Grebenka flora, from the main exposure of the Albian–Cenomanian Krivorechenskaya Formation in northeastern Russia, represents a range of plant communities from pioneer to mature forest that grew close to the mid-Cretaceous North Pole (>72°N). The diversity of this flora is dominated by angiosperms followed by conifers, ferns and other plant groups. The age is constrained by 40Ar/39Ar analyses of associated volcaniclastics (∼96.5 Ma), coupled with biostratigraphic correlation of the plant-bearing non-marine beds with marine units of the Krivorechenskaya Formation and the overlying Dugovskaya Formation. Limited palaeosol development and pronounced episodic floodplain aggradation indicate that the 100-m-thick plant-bearing volcaniclastic floodplain succession was deposited rapidly, resulting in excellent trapping and preservation of the plant communities, but dilution of the palynoflora. Analysis of the megaflora (>100 foliage taxa, plus woods and fructifications) provides a ‘snapshot’ of the mid-Cretaceous climate, and offers reliable quantitative climatic signals of conditions near the mid-Cretaceous North Pole. Multivariate analysis of leaf physiognomy (Climate Leaf Analysis Multivariate Program) on the whole flora suggests that the plants experienced a mean annual temperature of 13.0±1.8°C and a cold month mean temperature of 5.5±3.3°C. However, analyses of individual florules yield slightly different results that help constrain the uncertainties inherent in such an approach. These and other foliar physiognomic data are compared across the Arctic. | |
dc.subject | northeastern Russia | |
dc.subject | palaeobotany | |
dc.subject | palaeoenvironment | |
dc.subject | palaeoecology | |
dc.subject | palaeoclimate | |
dc.subject | Cretaceous | |
dc.title | PALAEOENVIRONMENT AND ECOLOGY OF THE MIDDLE CRETACEOUS GREBENKA FLORA OF NORTHEASTERN ASIA | |
dc.type | Статья | |
dc.subject.age | Mesozoic::Cretaceous | |
dc.subject.age | Мезозой::Меловая | ru |
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