Neogene And Quaternary Stratigraphy PDF Download

This study provides a framework biostratigraphy for pollen and spores in the Neogene and Quaternary of Yukon and adjacent Northwest Territories & Alaska. This biozonation is useful for correlating continental rocks with rocks on the northern continental margin, including the petroliferous Beaufort-Mackenzie Basin. This framework biozonation achieves an absolute chronology based on the study of many continental sections where ages are determined by independent and absolute measures. The study assembles the biozonation from seven sections and one borehole, and the palynological spectra from 163 samples from these sections were grouped & averaged to produce 21 composite spectra that depict the long-term pattern of vegetation change ranging from Early Miocene to late Quaternary. Pollen and spores are grouped and summed by environmental tolerances and physiognomy of the modern families & 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 the global climate and the climatic effects of regional tectonics. Six assemblage zones and five subzones are proposed to describe the palynological succession.