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TitleBiostratigraphic correlation of the western and eastern margins of of the Labrador-Baffin Seaway and implications
AuthorNorh-Hansen, H; Williams, G L; Fensome, R A
SourceGeological Survey of Denmark and Greenland Bulletin .
Alt SeriesEarth Sciences Sector, Contribution Series 20150377
PublisherGeological Survey of Denmark and Greenland
ProvinceNewfoundland and Labrador; Nunavut; Offshore region
Lat/Long WENS -80.0000 -40.0000 80.0000 60.0000
Subjectspaleontology; palynology; palynological analysis; palynological analyses; taxonomy; microfossils; palynomorphs; biostratigraphy; paleoenvironment; Cenozoic; Cretaceous
Illustrationslocation maps; cross-sections, stratigraphic; cross-sections; geological time charts; tables; photomicrographs
ProgramBaffin Project Managenment, GEM2: Geo-mapping for Energy and Minerals
AbstractNew palynological analysis of samples from 13 offshore wells on the Canadian Margin and six wells on the West Greenland Margin has led to a new event biostratigraphic framework for Cretaceous- Cenozoic strata of the Labrador Sea - Davis Strait - Baffin Bay (Labrador-Baffin Seaway) region. This framework is based on about 150 dinoflagellate cyst taxa and 30 acritarch, algal, fungal and plant microfossil (mostly miospore) taxa. In the systematics we include three new genera of dinocysts (Scalenodinium, Simplicidinium and Taurodinium), 16 new species of dinocysts (Chirop - teridium gilbertii, Chytroeisphaeridia hadra, Cleistosphaeridium elegantulum, Cleistosphaeridium palmatum, Dapsilidinium pseudoinsertum, De flan drea borealis, Evittosphaerula? foraminosa, Gingi - nodinium? flexidentatum, Hystrichosphaeridium quadratum, Hystrichostrogylon digitus, Impletosphaeridium apodastum, Scalenodinium scalenum, Surculosphaeridium convocatum, Talladinium pellis, Taurodinium granulatum and Trithyrodinium? conservatum), four emendations of dinocyst genera (Alterbidinium, Chatangiella, Chiropteridium and Surculosphaeridium), six new combinations for dinocyst species (Alterbidinium biaperturum, Deflandrea majae, Kleithriasphaeridium mantellii, Simplicidinium insolitum, Spongodinium grossum, Spongodinium obscurum), one new acritarch species (Fromea quadrangularis), one new miospore species (Baculatisporites crenulatus) and one new combination for miospores (Tiliaepollenites crassipites). Most of the taxa included provide age information, almost exclusively last occurrences (range 'tops'), but some are useful mainly for environmental interpretations. Collectively, they provide a powerful tool for helping to establish the geological history of the Labrador-Baffin Seaway.
Summary(Plain Language Summary, not published)
We have carried out new analyses of fossil dinocysts, spores and pollen from 17 petroleum exploration wells in the Labrador-Baffin Seaway between Canada and Greenland, which has led to a new biostratigraphic framework (and thus timing) for Cretaceous¿Cenozoic strata of the region; this is based mainly on the timing of the extinctions of particular species. This has provided us with new insights into the geological history of the Seaway, including its origins, invasions and retreats of the sea, and changing climates over the past 100 million years. These insights in turn will lead to a better understanding of potential petroleum systems in the regions, especially off Labrador and Nunavut.