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Megaspores and associated palynofloras of Middle Jurassic fluvio-deltaic sequences in North Yorkshire and the northern North Sea: a biofacies-based approach to palaeoenvironmental analysis and modelling

Peter H. Morris and David J. Batten
Journal of Micropalaeontology, 35, 151-172, 24 May 2016, https://doi.org/10.1144/jmpaleo2015-017
Peter H. Morris
1Microstrat Services, Southcott, Buckland Brewer, Bideford, Devon EX39 5LU, UK
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  • For correspondence: microstratuk@aol.com
David J. Batten
2Department of Geography and Earth Sciences, Aberystwyth University, Penglais, Aberystwyth SY23 3DB, Wales, UK
3School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK
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Abstract

Outcrops of the Early Bajocian, Gristhorpe Member (Ravenscar Group) in North Yorkshire have been subjected to a multi-disciplinary analysis which establishes a key reference section at Yons Nab. Eight micro-biofaces types (MBs) are defined based on counts of transitional marine microfaunas, megaspores and plant-derived debris. Associated palynofloral associations (PAs) are used to qualify the micro-biofacies defined to provide an integrated model for interpreting salinity–freshwater trends associated with deltaic progradation and retreat. Megaspore and small-spore trends within the delta-plain are shown to have been closely linked to peat-mires forming in topographic lows, with variations across the delta-plain attributable to the presence of the semi-permanent and seasonal water tables. A reconstruction of the floodplain–peat-mire depositional setting is proposed where the composition of host vegetation (e.g. ferns, lycopsids) varied in relation to groundwater levels. Biostratigraphic correlation within the Gristhorpe Member is attempted using the base of ‘established’ delta-plain deposition (megaspore dominant MBs/spore-dominant PAs) and the top and base agglutinated foraminifera-dominant MBs (brackish). Using these criteria the Gristhorpe Member is modelled in terms of a southward progradation of delta-plain facies into a bay-fill sequence, which persisted at Yons Nab. With the delta-plain established, the MB/PA trends and sedimentology suggest a northward shift towards the higher delta-plain, with seasonal standing water only. The MB/PA model was tested on core samples from the coeval lower Brent Group from northern North Sea well 34/10-B-12 (Gullfaks Field); MB/PA trends are shown to compare closely with those of the Gristhorpe Member at Yons Nab, with the same megaspore/small-spore associations developed within similar lithofacies. On this basis transitional marine, bay-fill and delta-plain deposition are defined in the cored section. These comparative data suggest that the dispersal of megaspore and miospore host floras occurred effectively across the Mid North Sea High, and that they colonized the same niche habitats associated with bay-fill and delta-plain development.

  • North Yorkshire
  • Middle Jurassic
  • megaspores
  • miospores
  • micro-biofacies
  • palynofacies
  • Brent Group
  • © 2016 The Author(s)
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Journal of Micropalaeontology: 35 (2)
Journal of Micropalaeontology
Volume 35, Issue 2
July 2016
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Megaspores and associated palynofloras of Middle Jurassic fluvio-deltaic sequences in North Yorkshire and the northern North Sea: a biofacies-based approach to palaeoenvironmental analysis and modelling

Peter H. Morris and David J. Batten
Journal of Micropalaeontology, 35, 151-172, 24 May 2016, https://doi.org/10.1144/jmpaleo2015-017
Peter H. Morris
1Microstrat Services, Southcott, Buckland Brewer, Bideford, Devon EX39 5LU, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: microstratuk@aol.com
David J. Batten
2Department of Geography and Earth Sciences, Aberystwyth University, Penglais, Aberystwyth SY23 3DB, Wales, UK
3School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK
  • Find this author on Google Scholar
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Megaspores and associated palynofloras of Middle Jurassic fluvio-deltaic sequences in North Yorkshire and the northern North Sea: a biofacies-based approach to palaeoenvironmental analysis and modelling

Peter H. Morris and David J. Batten
Journal of Micropalaeontology, 35, 151-172, 24 May 2016, https://doi.org/10.1144/jmpaleo2015-017
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  • Article
    • Abstract
    • Geological background
    • Field sections analysed and methodology
    • Sedimentology
    • Megaspore and plant debris distribution at Yons Nab and Cloughton Wyke
    • Palynofacies
    • Integrated micro-biofacies/palynofacies model and palaeoenvironmental interpretation
    • Peat-mires and the reconstruction of plant communities
    • High-resolution correlation using the MB/PA model
    • Regional application of the MB/PA model to the Brent Group, northern North Sea
    • Conclusions
    • Acknowledgements and Funding
    • References
  • Figures & Data
  • Info & Metrics
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