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Clastic dykes in the Namurian shales of Co. Leitrim, Republic of Ireland

Published online by Cambridge University Press:  01 May 2009

A. Brandon
A. Brandon
Affiliation:
Geological Survey of Northern Ireland 20 College Gardens Belfast BT9 6BS
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Summary

A description is given of the numerous thin dolomitic sandstone dykes cutting dark marine shales of E1a age in Co. Leitrim. They are almost wholly confined to the Dough–Thur Mountain area, which is cut by the Caledonoid trending Ox Mountain and Belhavel Faults. It is thought probable that movement along one of these faults, possible in E1c times, conferred thixotropic properties to a sand horizon in the marine shales and also produced fractures in the shales up which the sand was intruded.

Type
Articles
Information
Geological Magazine , Volume 109 , Issue 4 , July 1972 , pp. 361 - 367
Copyright
Copyright © Cambridge University Press 1972

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References

Brandon, A. 1972. The Upper Viséan and Namurian shales of the Doagh Outlier, Co. Fermanagh, Northern Ireland. Ir. Nat. J. 18, 159–70.Google Scholar
Evans, O. F. & Ingram, R. L. 1943. An experimental study of the influence of grain size on the size of oscillation ripple marks. J. sedim. Petrol. 13, 117–20.Google Scholar
Gill, W. D. & Kuenen, P. H. 1958. Sand volcanoes on slumps in the Namurian basin of western Co. Clare, Q. Jl. geol. Soc. Lond. 113, 441–60.CrossRefGoogle Scholar
Greensmith, J. T. 1957. A sandstone dyke near Queensferry, West Lothian. Trans. Edinb. geol. Soc. 17, 54–9.CrossRefGoogle Scholar
Lambrecht, L. & Thorez, J. 1966. Filons clastiques intraformationnels dans le Namurien de Belgique. C.r. hebd. Séanc. Acad. Sci., Paris Ser. D, 263, 1556–9.Google Scholar
Powers, M. C. 1953. A new roundness scale for sedimentary particles. J. sedim. Petrol. 23, 117–9.CrossRefGoogle Scholar
Shrock, R. R. 1948. Sequence in layered rocks. McGraw-Hill, London. 507 pp.Google Scholar
Stephens, J. V., Mitchell, G. H. & Edwards, W. 1953. Geology of the country between Bradford and Skipton (Sheet 69). Mem. geol. Surv. U.K.Google Scholar
Waterson, C. D. 1950. Note on the sandstone injections of Eathie Haven, Cromarty. Geol. Mag. 87, 133–9.CrossRefGoogle Scholar