Hostname: page-component-78c5997874-t5tsf Total loading time: 0 Render date: 2024-11-06T07:16:24.453Z Has data issue: false hasContentIssue false
  • English
  • Français

Unrecorded Inliers of Silurian Rocks, near Wickwar, Gloucestershire, with Notes on the Occurrence of a Stromatolite

Published online by Cambridge University Press:  01 May 2009

W. F. Whittard  and
Stanley Smith
Get access Rights & Permissions [Opens in a new window]

Extract

The Upper Palaeozoic rocks at Wickwar pass eastwards below Mesozoic strata, but about half a mile farther to the east the pre-Triassic surface is laid bare in places in the floor of the Little Avon River for a distance of 1,300 yards between Stmt Bridge and a point some 360 yards below Horse Bridge. The rocks found here are of Silurian age. Exposures are small and discontinuous since the stream has covered the valley floor with its own deposits and only at intervals does it flow on, or cut laterally into the solid rock. Moreover, the base of the Trias, which is nowhere many feet above the thalweg, sinks twice below stream level, dividing the Silurian outcrop into three inliers. The first two, conveniently styled the northern and southern Sturt Bridge Inliers, are separated by only 40 yards of Triassic deposits, but between the more northerly of these and the Horse Bridge Inlier 330 yards of Triassic rocks intervene.

Type
Articles
Information
Geological Magazine , Volume 81 , Issue 2 , April 1944 , pp. 65 - 76
Copyright
Copyright © Cambridge University Press 1944

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

Cantrill, T. C., and Smith, B., 1919. On a Boring for Coal at Winterbourne Gloucestershire. Summ. Progr. Geol. Surv. Gt. Britain for 1918.Google Scholar
Cloud, P. E., 1942. Notes on Stromatolites. Am. Journ. Science, ccxl.Google Scholar
Hallimond, A. F., 1925. Special Reports on the Mineral Resources of Great Britain. Vol. xxix. Iron Ores: Bedded Ores of England and Wales. Petrography and Chemistry. Mem. Geol. Surv. Gt. Britain.Google Scholar
Hawkins, H. L., 1942. Some Episodes in the Geological History of the South of England. Quart. Journ. Geol. Soc., xcviii.Google Scholar
King, W. W., 1934. The Downtonian and Dittonian Strata of Great Britain and North-Western Europe. Quart. Journ. Geol. Soc., xc.Google Scholar
Lillie, D. G., 1910. Notes on the Fossil Flora of the Bristol Coal-field. Geol. Mag., xlvii.Google Scholar
Moore, L. R., and Trueman, A. E., 1937. The Coal Measures of Bristol and Somerset. Quart. Journ. Geol. Soc., xciii.Google Scholar
Moore, L. R., 1939. The Structure of the Bristol and Somerset Coalfields. Proc. Geol. Assoc., l.Google Scholar
Moore, L. R., 1942. The Bristol and Somerset Coalfields with particular reference to the prospects of future development. Proc. South Wales Inst. Engineers, lvii.Google Scholar
Murchison, R. I., 1839. The Silurian System, London.Google Scholar
Pringle, J., 1921. On a Boring for Coal at Yate, Gloucestershire. Summ. Progr. Geol. Surv. Gt. Britain for 1920.Google Scholar
Reed, F. R. C., and Reynolds, S. H., 1908. On the Fossiliferous Silurian Rocks of the Southern Half of the Tortworth Inlier. Quart. Journ. Geol. Soc., lxiv.Google Scholar
Richardson, L., 1904. Notes on the Rhaetic Rocks around Charfield, Gloucestershire. Geol. Mag., xli.Google Scholar
Sanders, W., 1862. Map of the Bristol Coalfields and Country Adjacent in nineteen sheets. Scale, 4 inches to 1 mile. Bristol.Google Scholar
Sherlock, R. L., and Hollingworth, S. E., 1938. Special Reports on the Mineral Resources of Great Britain. Vol. iii. Gypsum and Anhydrite. Celestine and Strontianite. Mem. Geol. Surv. Gt. Britain. 3rd ed.Google Scholar