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On a Volcanic Vent and Associated Monchiquite Intrusions in Monmouthshire

Published online by Cambridge University Press:  01 May 2009

V. A. Eyles  and
C. R. K. Blundell
V. A. Eyles
Affiliation:
Geological Survey and Museum, South Kensington, S.W. 7.
C. R. K. Blundell
Affiliation:
Dept. of Geology, University College, Cardiff
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Abstract

Quarrying activity adjacent to the well-known intrusion of monchiquite cutting Old Red Sandstone near Usk, in Monmouthshire (originally described by W. S. Boulton, in 1911), shows that the monchiquite proper is associated with an agglomerate-filled vent. Fossiliferous blocks contained within the agglomerate (first recorded by C. R. K. Blundell) show that the volcanic activity took place not earlier than in Lower Carboniferous time; and throw light on the former extension of the Carboniferous Limestone in this area.

Type
Articles
Information
Geological Magazine , Volume 94 , Issue 1 , February 1957 , pp. 54 - 57
Copyright
Copyright © Cambridge University Press 1957

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References

REFERENCES

Boulton, W. S., 1911. On a Monchiquite Intrusion in the Old Red Sandstone of Monmouthshire. Quart. Journ. Geol. Soc., lxvii, 460–76.CrossRefGoogle Scholar
Cox, A. H., 1954. The Usk Monchiquite—A “Pipe Intrusion”. Geol. Mag., xci, 519.CrossRefGoogle Scholar
Eyles, V. A., Simpson, J. B., and MacGregor, A. G., 1949. Geology of Central Ayrshire, 2nd ed. Mem. Geol. Surv. Scotland, 103–6.Google Scholar
MacGregor, M., and MacGregor, A. G., 1948. British Regional Geology: The Midland Valley of Scotland. Mem. Geol. Surv., 65–6.Google Scholar
Pocock, R. W., 1940. In Summary of Progress … for 1938. Mem. Geol. Surv., 30.Google Scholar
Tidmarsh, W. G., 1932. The Permian Lavas of Devon. Quart. Journ. Geol. Soc., lxxxviii, 712–72.CrossRefGoogle Scholar