Petroleum geology of the Upper Jurassic – Lower Cretaceous of East and North-East Greenland: Blokelv-1 borehole, Jameson Land Basin: Biostratigraphy of the Hareelv Formation (Upper Jurassic) in the Blokelv-1 core, Jameson Land, central East Greenland

• Main Authors: Peter Alsen, Stefan Piasecki
• Format: Article in Journal/Newspaper
• Language: English
• Published: Geological Survey of Denmark and Greenland 2018
• Subjects: Jameson Land Basin; East Greenland; ammonites; dinoflagellate cysts; biostratigraphy; chronostratigraphy; Oxfordian; Kimmeridgian; Geology; QE1-996.5; Geophysics. Cosmic physics; QC801-809; Greenland; Jameson Land; Hareelv; Geological Survey of Denmark and Greenland Bulletin
• Online Access: https://doaj.org/article/757d69c4345643478590997602637ddc

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.