Abstract
The Hareelv Formation in the Blokelv-1 core is biostratigraphically subdivided by means of ammonite and dinoflagellate cyst stratigraphy. The succession ranges from the Oxfordian C. densiplicatum Chronozone to the Volgian P. elegans Chronozone. The mudstones of the Blokelv-1 core are characterised by large amounts of amorphous organic matter. This hampers the preparation and identification of dinoflagellate cysts, which are also commonly degraded and corroded. Ammonites, on the other hand, are common and well-preserved in the core, contrasting with that observed in the equivalent facies and stratigraphic interval at outcrop. Integration of the ammonite and dinoflagellate cyst biostratigraphical data yields a robust chronostratigraphic subdivision of the middle Oxfordian – lowermost Volgian cored section.
Highlights
The Hareelv Formation in the Blokelv-1 core is biostratigraphically subdivided by means of ammonite and dinoflagellate cyst stratigraphy
Ammonites and dinoflagellate cysts have been applied as the principal means of biostratigraphic dating of the fully cored Blokelv-1 borehole (GEUS 511101), which drilled through 234.80 m of the Upper Jurassic in southern Jameson Land (Figs1–3)
A suite of analyses was undertaken in the Blokelv-1 borehole study, as presented in this bulletin, in order to characterise this important Upper Jurassic reference section for the northern North Atlantic region; an integrated study of the palyno- and ammonite biostratigraphy was a central element in this study and forms the subject of this paper
Summary
The Hareelv Formation in the Blokelv-1 core is biostratigraphically subdivided by means of ammonite and dinoflagellate cyst stratigraphy. Ammonites and dinoflagellate cysts have been applied as the principal means of biostratigraphic dating of the fully cored Blokelv-1 borehole (GEUS 511101), which drilled through 234.80 m of the Upper Jurassic in southern Jameson Land (Figs). Ammonites and dinoflagellate cysts have been applied as the principal means of biostratigraphic dating of the fully cored Blokelv-1 borehole (GEUS 511101), which drilled through 234.80 m of the Upper Jurassic in southern Jameson Land (Figs1–3) It was the first of three core wells drilled by GEUS in 2008–2010 as part of a campaign that aimed to document the petroleum potential of the Upper Jurassic mudstone successions in central East Greenland and North-East Greenland (Bojesen-Koefoed et al 2009, 2014). Complementary core analysis programmes were subsequently undertaken by GEUS in fully cored boreholes drilled in the Bernbjerg Formation in the Wollaston Forland Basin of North-East Greenland to extend
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