Galloway, JM, Tullius, DN, Evenchick, CA et al. (3 more authors) (2015) Early Cretaceous vegetation and climate change at high latitude: Palynological evidence from Isachsen Formation, Arctic Canada. Cretaceous Research, 56. 399 - 420. ISSN 0195-6671
Abstract
Quantitative palynology of the marginal marine and deltaic-fluvial Isachsen Formation of the Sverdrup Basin, Canadian Arctic, provides insight into high latitude climate during much of the Early Cretaceous (Valanginian to early Aptian). Detrended Correspondence Analysis of main pollen and spore taxa is used to derive three ecological groupings influenced by moisture and disturbance based on the botanical affinities of palynomorphs: 1) a mixed coniferous assemblage containing both lowland and upland components; 2) a conifer-filicopsid community that likely grew in dynamic lowland habitats; and, 3) a mature dry lowland community composed of Cheirolepidiaceans. Stratigraphic changes in the relative abundance of pollen and spore taxa reflect climate variability in this polar region during the ~20 Mya history of the Isachsen Formation. The late Valanginian was relatively cool and moist and promoted lowland conifer-filicopsid communities. Warming in the Hauterivian resulted in the expansion coniferous communities in well-drained or arid hinterlands. A return to relatively cool and moist conditions in the Barremian resulted in the expansion of mixed lowland communities. This work demonstrates the utility of a multivariate statistical approach to palynology to provide insight into the composition and dynamics of ecosystems and climate of high latitude regions during the Early Cretaceous.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015, Elsevier. This is an author produced version of a paper published in Cretaceous Research. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Isachsen Formation; Sverdrup basin; Cretaceous; Canada; Arctic; Palynology |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Geography (Leeds) > Ecology & Global Change (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 02 Oct 2015 08:12 |
Last Modified: | 07 Jul 2016 05:53 |
Published Version: | http://dx.doi.org/10.1016/j.cretres.2015.04.002 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.cretres.2015.04.002 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:90436 |