Spicer, Robert A.; Ahlberg, Anders; Herman, Alexei B.; Kelley, Simon P.; Raikevich, Mikhail I. and Rees, Peter M.
|DOI (Digital Object Identifier) Link:||http://dx.doi.org/10.1016/S0031-0182(02)00247-X|
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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.
|Item Type:||Journal Article|
|Keywords:||Cretaceous; northeastern Russia; palaeobotany; palaeoenvironment; palaeoecology; palaeoclimate|
|Academic Unit/Department:||Science > Environment, Earth and Ecosystems
|Interdisciplinary Research Centre:||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)|
|Depositing User:||Robert Spicer|
|Date Deposited:||20 Jul 2006|
|Last Modified:||14 Jan 2016 16:12|
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