Palynology of Faroe-Shetland Basin well 204/27a-1 between 2059.91 and 2137.00 m

Riding, J.B. ORCID: 2018 Palynology of Faroe-Shetland Basin well 204/27a-1 between 2059.91 and 2137.00 m. Nottingham, UK, British Geological Survey, 13pp. (CR/17/070N) (Unpublished)

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As part of Phase 3 of the BGS Faroe-Shetland Consortium project on the Jurassic of the UK sector of the Faroe-Shetland Basin, detailed logging of core from well 204/27a-1 was undertaken. Forty-four core samples were taken for palynology between 2059.91 and 2137.00 m in order to provide age determinations and additional facies information. The samples were somewhat variable, but generally were relatively poor in productivity throughout and several horizons proved devoid of palynomorphs. The productive samples were generally dominated by poorly preserved terrestrially derived pollen and spores. Marine palynomorphs, where present, were also poorly preserved and of low diversity. A marine setting is indicated by the productive horizons. The 37 samples between 2059.91 and 2122.77 m in this well are of Early–Mid Volgian to Ryazanian–Valanginian transition in age. The uppermost sample (1) at 2059.91 m is assigned to the Ryazanian–Valanginian transition due to the occurrence of the chorate dinoflagellate cyst Systematophora palmula. The succession from 2061.95 to 2078.05 m (samples 2 to 7) is deemed to be Mid Volgian to Ryazanian in age largely on the basis of the occurrence of Cribroperidinium hansenii. The following interval between 2081.47 and 2113.20 m (samples 8 to 25 ) is assigned to the Mid Volgian on dinoflagellate cyst evidence. The key taxa are Cribroperidinium gigas, Cribroperidinium hansenii, Muderongia simplex (‘sp. A’) and Senoniasphaera jurassica. Specifically, range tops of Muderongia simplex (‘sp. A’) and Senoniasphaera jurassica at 2081.47 m indicate the Mid Volgian Kerberus zone. The lowermost seven samples (38–44) between 2123.60 and 2137.00 m proved barren of palynomorphs, and hence cannot be dated. The succession between 2113.90 and 2122.77 m (samples 26 to 37) is interpreted as being no older than Volgian, and hence Early to Mid Volgian, on the basis of the sporadic presence of the highly ornamented spore genus Cicatricosisporites.

Item Type: Publication - Report
Funders/Sponsors: British Geological Survey
Additional Information. Not used in RCUK Gateway to Research.: This item has been internally reviewed, but not externally peer-reviewed. Report made open in June, 2021.
Date made live: 07 Jul 2021 12:20 +0 (UTC)

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