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TitleNeogene and Quaternary quantitative palynostratigraphy and paleoclimatology from sections in Yukon and adjacent Northwest Territories and Alaska
AuthorWhite, J M; Ager, T A; Adam, D P; Leopold, E B; Liu, G; Jetté, H; Schweger, C E
SourceGeological Survey of Canada, Bulletin 543, 1999, 30 pages (1 sheet), (Open Access)
PublisherNatural Resources Canada
Mediapaper; on-line; digital
File formatpdf
ProvinceYukon; Northwest Territories
NTS107D; 117A
AreaMackenzie River; Taglu; Upper Ramparts Canyon; Canyon Village; McCallum Creek; Lost Chicken Mine; Canada; United States of America
Lat/Long WENS-164.0000 -134.0000 70.0000 63.0000
Subjectspaleontology; stratigraphy; environmental geology; Nature and Environment; Neogene; pollen; spores; pollen analyses; palynology; Miocene; environmental studies; environmental impacts; pollen assemblages; pollen stratigraphy; biostratigraphy; paleoclimates; stratigraphic correlations; stratigraphic analyses; vegetation; Usibelli Group; plants; Quaternary; Tertiary
Illustrationssketch maps; analyses
Released1999 12 01; 2013 08 13
AbstractA quantitative pollen and spore zonation for the Neogene and Quaternary of Yukon, western Northwest Territories and central and northern Alaska has been assembled from seven sections and one borehole. The palynological spectra from 163 samples from these sections were grouped and averaged within the groups to produce twenty-one composite spectra that depict the long-term pattern of vegetation change. The oldest record included in the study is estimated to be within the late Early Miocene (ca. 18.3 Ma) and the record extends to the late Quaternary.
Pollen and spores are grouped and summed by environmental tolerances and physiognomy of the modern families and genera of plants to which they are related. Using these groups, pollen and spore ratios are drawn to track environmental parameters - temperature, forest canopy cover, and paludification of the study sites. Biostratigraphic and paleoecological patterns are explained in terms of known changes in global climate and the climatic effects of regional tectonics. Six assemblage zones and five subzones are proposed to describe the palynological succession.