Jurassic dinoflagellate cyst stratigraphy of Store Koldewey, North-East Greenland

The Jurassic of Store Koldewey comprises a Middle Jurassic succession towards the south and an Upper Jurassic succession towards the north. Both successions onlap crystalline basement and coarse sediments dominate. Three main lithostratigraphical units are recognised: the Pelion Formation, including...

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Bibliographic Details
Published in:Geological Survey of Denmark and Greenland (GEUS) Bulletin
Main Authors: Piasecki, Stefan, Callomon, John H., Stemmerik, Lars
Format: Article in Journal/Newspaper
Language:English
Published: Geological Survey of Denmark and Greenland (GEUS) 2004
Subjects:
ammonites
Boreal
dinoflagellate cysts
Jurassic
North-East Greenland
Store Koldewey
Svalbard
Greenland
Peary
Jameson Land
Peary Land
Hold with Hope
Milne Land
Spath Plateau
East Greenland
North Greenland
Store koldewey
Online Access:https://geusbulletin.org/index.php/geusb/article/view/4810
https://doi.org/10.34194/geusb.v5.4810
Description
Summary:The Jurassic of Store Koldewey comprises a Middle Jurassic succession towards the south and an Upper Jurassic succession towards the north. Both successions onlap crystalline basement and coarse sediments dominate. Three main lithostratigraphical units are recognised: the Pelion Formation, including the Spath Plateau Member, the Payer Dal Formation and the Bernbjerg Formation. Rich marine macrofaunas include Boreal ammonites and the successions are dated as Late Bathonian – Early Callovian and Late Oxfordian – Early Kimmeridgian on the basis of new collections combined with material in earlier collections. Fine-grained horizons and units have been analysed for dinoflagellate cysts and the stratigraphy of the diverse and well-preserved flora has been integrated with the Boreal ammonite stratigraphy. The dinoflagellate floras correlate with contemporaneous floras from Milne Land, Jameson Land and Hold with Hope farther to the south in East Greenland, and with Peary Land in North Greenland and Svalbard towards the north. The Middle Jurassic flora shows local variations in East Greenland whereas the Upper Jurassic flora gradually changes northwards in East Greenland. A Boreal flora occurs in Peary Land and Svalbard. The characteristic and stratigraphically important species Perisseiasphaeridium pannosum and Oligosphaeridium patulum have their northernmost occurrence on Store Koldewey, whereas Taeniophora iunctispina and Adnatosphaeridium sp. extend as far north as Peary Land. Assemblages of dinoflagellate cysts are used to characterise significant regional flooding events and extensive sequence stratigraphic units.

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