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Journal of the Geological Society; 1993; v. 150; issue.5; p. 819-822;
DOI: 10.1144/gsjgs.150.5.0819
© 1993 Geological Society of London

Specials

Deflection versus reflection of sediment gravity flows in the late Llandovery Rhuddnant Grits turbidite system, Welsh Basin

C. J. CLAYTON

Department of Earth Sciences, Downing Street, Cambridge, CB2 3EQ, UK

The Rhuddnant Grits turbidite system was deposited in an elongate, fault-bounded trough, an apparently ideal locality for the reflection of sediment gravity flows as solitons. However, 280 palaeocurrent readings from turbidite sandstones do not show the expected high angle discrepancies between palaeocurrent directions from sole structures and those from cross-lamination. Palaeocurrents orthogonal to the bounding lineament are not generally observed. Instead there is a gradual, progressive, anticlockwise deflection of the currents with distance from source. This may be explained by banking of the currents against an intrabasinal slope, by the Coriolis effect, or by a combination of the two processes.




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