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TitleThe last 100 million years on the Scotian Margin, offshore eastern Canada: and event stratigraphic scheme emphasizing biostratigraphic data
AuthorFensome, R A; Crux, J A; Gard, I G; MacRae, R A; Williams, G L; Thomas, F C; Fiorini, F; Wach, G
SourceAtlantic Geology vol. 44, 2008 p. 93-126, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20070598
PublisherAtlantic Geology
Mediapaper; on-line; digital
RelatedThis publication is related to The last 100 million years on the Scotian Margin, offshore eastern Canada: an event stratigraphic scheme emphasizing biostratigraphy
File formatpdf
ProvinceEastern offshore region
AreaScotian Margin
Lat/Long WENS -65.0000 -58.0000 44.5000 42.7500
Subjectsstratigraphy; paleontology; fossils; biostratigraphy; stratigraphic correlations; pollen; spores; wells; nannofossils; microfossils; Upper Cretaceous; lithostratigraphy; stratigraphic analyses; foraminifera; dinocysts; Sauk A-57 well; Shelburne G-29 well; Demascota G-32 well; Hesper I-52 well; Onondaga E-84 well; Wenonah J-75 well; Shubenacadie H-100 well; Cenozoic; Cretaceous
Illustrationsstratigraphic cross-sections; sketch maps
ProgramSecure Canadian Energy Supply
Released2008 12 12
AbstractIn order to provide a detailed stratigraphic framework for the Late Cretaceous and Cenozoic basin fill of the Scotian Margin (the continental shelf and continental slope off Nova Scotia, eastern Canada), we have developed an event-biostratigraphic scheme based mainly on new analyses of several exploration wells. They include Demascota G-32, Hesper I-52, Onondaga E-84 and Wenonah J-75 on the continental shelf, as well as Shelburne G-29 and Shubenacadie H-100 on the continental slope. Several microfossil groups are involved in this study, most notably dinoflagellate cysts (dinocysts) and nannofossils, with the former generally providing more diverse assemblages and the latter more precise calibration with global correlations. Because most of the material studied is from cuttings samples, we have
relied largely on last appearance datums (LADs). The scheme incorporates information from about 250 microfossil species (or groups of species), delimiting about 180 events, of which about 50 percent are based on nannofossils, some 46 percent on palynomorphs and 4 percent on foraminifera. Not all events occur in all wells and the scheme needs to be tested against future observations: nevertheless, it represents a considerable advance on previous schemes, which were based mostly on broad zones rather than detailed events. Moreover, it allows for a more refined assessment of ages of geological events, such as the late Paleocene gamma spike and the incision of the Wenonah Canyon. And it provides an accurate age context for ongoing stratigraphic, sedimentological and paleoenvironmental studies, and ultimately for a fuller understanding of petroleum systems on the Scotian Margin.

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