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Palaeomagnetic correlation of the Upper Triassic of Somerset, England, with continental Europe and eastern North America

J. C. BRIDEN and B. A. DANIELS
Journal of the Geological Society, 156, 317-326, 1 March 1999, https://doi.org/10.1144/gsjgs.156.2.0317
J. C. BRIDEN
1Environmental Change Unit, University of Oxford, 5 South Parks Road, Oxford 0X1 3UB, UK (e-mail: )
2Department of Earth Sciences, University of Oxford, Parks Road, Oxford 0X1 3PR, UK
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  • For correspondence: jim.briden@ecu.ox.ac.uk
B. A. DANIELS
2Department of Earth Sciences, University of Oxford, Parks Road, Oxford 0X1 3PR, UK
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Abstract

Three Normal and three Reversed palaeomagnetic polarity zones were identified in the exposed 67 m section of Mercia Mudstone at St Audrie’s Bay, Somerset, which has been regarded as being of Norian age on limited biostratigraphic evidence. The polarity sequence is correlated with magnetozones E15 to E17 in the Newark Basin, New Jersey, further supporting the inferred Norian age and tentatively placing it in the mid-Norian. Correlations with the northern North Sea and the Alps are also suggested. Results from Doniford Bay, where tectonic dips are steeper but which cannot be correlated precisely with the St Audrie’s section, are incorporated for the calculation of the mean direction of Characteristic Remanent Magnetization which has declination 30.8° and inclination +34.3° (N=27 horizons, α95 = 5.1°). The corresponding palaeomagnetic pole is 49.6°N, 128.4°E (dp = 3.3°, dm = 5.8°), which also correlates with the Norian of the Newark Basin, while possibly indicating that small adjustments should be made to the orientation of all or part of Britain within the 1965 Bullard et al. configuration as a representation of Late Triassic geography.

  • Triassic
  • Norian
  • Somerset
  • magnetostratigraphy
  • palaeomagnetism
  • © Geological Society of London 1999

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Journal of the Geological Society: 156 (2)
Journal of the Geological Society
Volume 156, Issue 2
March 1999
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Palaeomagnetic correlation of the Upper Triassic of Somerset, England, with continental Europe and eastern North America

J. C. BRIDEN and B. A. DANIELS
Journal of the Geological Society, 156, 317-326, 1 March 1999, https://doi.org/10.1144/gsjgs.156.2.0317
J. C. BRIDEN
1Environmental Change Unit, University of Oxford, 5 South Parks Road, Oxford 0X1 3UB, UK (e-mail: )
2Department of Earth Sciences, University of Oxford, Parks Road, Oxford 0X1 3PR, UK
  • Find this author on Google Scholar
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  • For correspondence: jim.briden@ecu.ox.ac.uk
B. A. DANIELS
2Department of Earth Sciences, University of Oxford, Parks Road, Oxford 0X1 3PR, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Palaeomagnetic correlation of the Upper Triassic of Somerset, England, with continental Europe and eastern North America

J. C. BRIDEN and B. A. DANIELS
Journal of the Geological Society, 156, 317-326, 1 March 1999, https://doi.org/10.1144/gsjgs.156.2.0317
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