Hostname: page-component-cd9895bd7-lnqnp Total loading time: 0 Render date: 2024-12-24T16:53:28.170Z Has data issue: false hasContentIssue false
  • English
  • Français

Solution Subsidence Outliers of Millstone Grit on the Carboniferous Limestone of the North Crop of the South Wales Coalfield

Published online by Cambridge University Press:  01 May 2009

Trevor M. Thomas
Trevor M. Thomas
Affiliation:
“Ty Derw,” Ely Valley Road, Talbot Green, Llantrisant, Glam.
Get access Rights & Permissions [Opens in a new window]

Abstract

A record has been made of the outliers of Basal Grit occurring on the Limestone of the North Crop of the South Wales Coalfield, some of which have not previously been located. The solution subsidence theory to account for their present anomalous levels when compared with the parent Grit outcrop to the south has been enlarged upon, and an attempt has been made to determine the mechanism of this subsidence which ranges in vertical extent up to a maximum of approximately 600 feet. The outliers are of economic importance since their predominant crumbly quartzose sandstones are a source of almost pure silica sand.

Type
Articles
Information
Geological Magazine , Volume 91 , Issue 3 , June 1954 , pp. 220 - 226
Copyright
Copyright © Cambridge University Press 1954

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Dixon, E. E. L., 1921. The Geology of the South Wales Coalfield. Part XIII: The County around Pembroke and Tenby. Mem. Geol. Survey.Google Scholar
Evans, D. G., and Jones, R. O., 1929. Notes on the Millstone Grit of the North Crop of the South Wales Coalfield. Geol. Mag., lxvi, 164.CrossRefGoogle Scholar
Fridley, H. M., 1939. Solution and Stream Piracy. Journ. Geol., xlvii, 178–189.CrossRefGoogle Scholar
George, T. N., 1927. The Carboniferous Limestone (Avonian) Succession of a Portion of the North Crop of the South Wales Coalfield. Quart. Journ. Geol. Soc., lxxxiii, 38–95.Google Scholar
George, T. N., and Robertson, T., 1929. The Carboniferous Limestone of the North Crop of the South Wales Coalfield. Proc. Geol. Assoc., xl, 18–40.Google Scholar
Kirkaldy, J. P., 1951. Solution of the Chalk in the Mimms Valley Herts. Proc. Geol. Assoc., lxi, 219–224.Google Scholar
Robertson, T., 1927 (second edition). The Geology of the South Wales Coalfield. Part II: Abergavenny. Mem. Geol. Survey.Google Scholar
Robertson, T., 1932 (second edition). The Geology of the South Wales Coalfield. Part V: The Country around Merthyr Tydfil. Mem. Geol. Survey.Google Scholar
Special Reports on the Mineral Resources of Great Britain, 1918 (Vol. vi). Refractory Materials: Canister and Silica-Rock, Sand for Open-Hearth Steel Furnaces, Dolomite Resources, and Geology. Mem. Geol. Survey.Google Scholar
Strahan, A., and Others, 1907. The Geology of the South Wales Coalfield. Part VII: The County around Ammanford. Mem. Geol. Survey.Google Scholar
Strahan, A., and Others, 1909. The Geology of the South Wales Coalfield. Part X: The County around Carmarthen. Mem. Geol. Survey.Google Scholar