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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

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